All tools

Loans, mortgages, savings, taxes, and other money calculators.

• 401(k) Retirement Savings Calculator
  Project your 401(k) balance at retirement. Model employee contributions, employer match, IRS catch-up limits, salary growth, and compound returns year by year.
• Annuity Payout Calculator
  Find the present value of an annuity or the payment required to satisfy a present value.
• APR to APY Converter - Annual Percentage Rate vs Yield
  Convert between APR (Annual Percentage Rate) and APY (Annual Percentage Yield) for any compounding frequency. Understand the true cost of loans and actual return on savings accounts.
• Auto Loan Calculator
  Calculate your monthly car payment, total interest, and true cost of ownership, including down payment, trade-in value, and sales tax.
• Black-Scholes Options Pricing Calculator
  Price European call and put options using the Black-Scholes-Merton model. Calculate delta, gamma, vega, theta, rho, and solve for implied volatility.
• Bond Price & Yield-to-Maturity Calculator
  Calculate bond price from YTM, or solve yield-to-maturity from price. See current yield, Macaulay duration, modified duration, convexity, and a full cash-flow schedule.
• Break-Even Calculator - Find Your Break-Even Point
  Calculate your break-even point in units and revenue. Enter fixed costs, variable costs, and selling price to see when your business becomes profitable.
• Budget Planner - 50/30/20 Rule Calculator
  Plan your monthly budget using the 50/30/20 rule. Allocate after-tax income to needs, wants, and savings, and track actual spending against targets in real time.
• CAGR Calculator - Compound Annual Growth Rate
  Calculate the Compound Annual Growth Rate (CAGR) for any investment. Enter a start value, end value, and number of years to get the annualised growth rate, total return, and year-by-year growth table.
• Capital Gains Tax Estimator
  Estimate federal capital gains tax on investment sales based on 2024 IRS brackets.
• Cash / Till Counter
  Count cash by entering the number of each bill and coin denomination to get an instant total.
• CD Ladder Calculator - Certificate of Deposit Ladder Strategy
  Build a CD ladder by splitting your savings across multiple CDs with staggered maturity dates. See total interest earned and maturity values for each rung.
• College / 529 Education Savings Plan Calculator
  Plan for college costs with this 529 savings calculator. Projects future tuition costs with inflation, estimates your savings growth, and shows the monthly contribution needed to reach your goal.
• Compound Interest Calculator - Future Value with Contributions
  Calculate compound interest and future value of an investment with optional monthly contributions. Choose compounding frequency and see a year-by-year breakdown. Free, private, runs in your browser.
• Cost-of-Living Comparison - Compare US City Costs
  Compare the cost of living between major US cities. See housing, groceries, utilities, and more, plus find out what salary you need to maintain your standard of living.
• Credit Card Payoff Calculator
  Calculate how long it will take to pay off a credit card balance and how much interest you will pay.
• Crypto P&L Calculator - Profit & Loss
  Calculate cryptocurrency profit or loss using FIFO, LIFO, or average cost basis. Add multiple purchase lots, set a sell price and exchange fee, and see your total gain/loss and break-even price.
• Debt Payoff Calculator - Avalanche & Snowball Strategies
  Calculate how long it will take to pay off your debts using the avalanche or snowball method. Compare strategies and see how extra payments save you money.
• Discount Calculator
  Calculate discounted price, savings amount, and discount percentage. Enter original price and discount %, or original and final price to find the discount.
• Dollar-Cost Averaging Calculator - DCA Investment Simulator
  Simulate dollar-cost averaging: invest a fixed amount on a recurring schedule and see your projected portfolio value over time. Compare DCA against a lump-sum investment.
• Electricity Bill Calculator - Estimate Your Monthly Power Cost
  Calculate your monthly electricity bill by entering your appliances, wattage, usage hours, and cost per kWh. Add multiple devices and see itemized kWh and cost breakdowns.
• Emergency Fund Calculator - How Long to Save Your Cushion
  Find out how much you need in an emergency fund and how long it will take to save it based on your monthly expenses, savings rate, and interest earned.
• Estate Value Calculator - Net Worth & Estate Planning
  Estimate the total value of an estate by listing assets and liabilities. Categorizes real estate, retirement accounts, investments, and personal property to show gross estate and net worth.
• FIRE Number Calculator - Financial Independence Retire Early
  Calculate your FIRE number (the savings needed to retire) and how many years until you reach financial independence. Uses the 4% safe withdrawal rule with adjustable parameters.
• Future Value Calculator
  Calculate the future value of a lump sum or annuity with compound interest.
• Gross-Up Calculator - Net to Gross Pay Calculator
  Calculate the gross pay needed to deliver a specific net (take-home) amount after taxes. Also converts gross pay to net. Useful for bonuses, reimbursements, and contractor payments.
• Hourly to Salary Calculator - Pay Rate Converter
  Convert between hourly wage and annual salary instantly. See daily, weekly, bi-weekly, semi-monthly, monthly, quarterly, and yearly pay for any rate.
• HSA / FSA Contribution Calculator
  Calculate your HSA or FSA tax savings, contribution limits, and projected investment growth.
• Inflation Calculator - Historical CPI Purchasing Power
  Calculate the purchasing power of money over time using historical US CPI-U data from 1913 to 2024. See how inflation has eroded the value of a dollar across decades.
• Investment Fee Calculator - See the True Cost of Fund Fees
  Compare two fee scenarios to see how expense ratios and management fees drain your investment portfolio over time. Visualize the compounding drag of fees over decades.
• Lakh / Crore to Million / Billion Converter
  Convert between the South Asian number system (lakhs, crores) and the Western system (millions, billions). Instantly convert any amount in either direction.
• Lease vs. Buy Car Calculator
  Compare the total cost of leasing vs. financing a vehicle. Enter money factor, residual value, APR, and hold period to see monthly payments and total out-of-pocket costs.
• Loan Amortization Schedule Calculator - Full Payment Table
  Generate a full loan amortization schedule for any mortgage, car loan, or personal loan. See every monthly payment broken down into principal and interest, plus total cost and interest paid.
• Loan Calculator
  Calculate monthly payment, total interest, and total cost for any fixed-rate loan. Enter loan amount, rate, and term. Results update instantly.
• Loan Comparison Calculator - Compare Loans Side by Side
  Compare two loan options side by side. See monthly payment, total interest, and total cost for each loan to find the better deal.
• Mortgage Calculator - Monthly Payment & Amortization Schedule
  Calculate your monthly mortgage payment including principal, interest, property tax, home insurance, PMI, and HOA. View the full amortization schedule. Free, private, runs in your browser.
• Mortgage Points Break-Even Calculator
  Calculate whether buying mortgage discount points is worth it. Enter your loan amount, interest rates, and points cost to see your monthly savings, break-even month, and total lifetime savings.
• Net Worth Calculator - Track Assets & Liabilities
  Calculate your net worth by entering your assets and liabilities. Track your progress over time with snapshots stored locally in your browser.
• NPV & IRR Calculator - Net Present Value & Internal Rate of Return
  Calculate the Net Present Value (NPV) and Internal Rate of Return (IRR) of any cash-flow series. Includes payback period, sensitivity analysis, and sample presets.
• P/E Ratio & Graham Number Intrinsic Value Calculator
  Calculate the P/E ratio, P/B ratio, earnings yield, Graham Number intrinsic value, PEG ratio, and margin of safety for any stock. Based on Benjamin Graham's value investing formulas.
• Position Size Calculator - Stock & Forex
  Calculate how many shares or units to buy based on your account size, entry price, stop-loss, and risk tolerance. Supports percent-risk, fixed-dollar, and Kelly Criterion methods.
• Present Value Calculator
  Calculate the present value of a future lump sum or annuity using discounted cash flow.
• Profit Margin Calculator
  Calculate gross profit margin, markup percentage, and operating margin from cost and revenue. Instant results.
• Refinance Calculator - Break-Even & Savings
  Find out whether refinancing your mortgage makes sense. Compare monthly savings, break-even month, and net savings over your planned hold period.
• Rent Affordability Calculator - 30% Rule & 50/30/20 Budget
  Find your maximum affordable rent using the 30% rule and 50/30/20 budget framework. Enter your gross annual income to see how much rent you can afford.
• Rent vs. Buy Calculator
  Compare the long-term cost of renting vs. buying a home. Model appreciation, opportunity cost, taxes, maintenance, and rent inflation to find your crossover year.
• Required Minimum Distribution (RMD) Calculator
  Calculate your IRS Required Minimum Distribution from a traditional IRA or 401(k). See a year-by-year withdrawal schedule using the official Uniform Lifetime Table.
• Retirement Calculator
  Project your retirement nest egg, see how many years your savings will last, and check if you're on track. Enter age, savings, contributions, and return assumptions.
• ROI Calculator
  Calculate return on investment (ROI), net gain, and annualized CAGR for any investment. Enter initial amount, final value, and optional holding period.
• Roth vs. Traditional IRA Calculator
  Compare Roth and Traditional IRA outcomes side by side. See which account leaves you with more after-tax money at retirement based on your current and expected future tax rates.
• Salary Comparison by City - Cost of Living Adjusted
  Compare job offers and salaries across cities after adjusting for cost of living. Uses a cost of living index to show which salary has the most real buying power.
• Salary to Hourly Calculator
  Convert between annual salary, monthly, biweekly, weekly, and hourly pay rates. Adjust hours per week and weeks worked per year.
• Sales Commission Calculator
  Calculate flat-rate or tiered sales commissions and effective commission rate.
• Sales Tax Calculator - Add or Remove Tax Instantly
  Calculate sales tax by adding tax to a pre-tax price or removing tax from a total. Includes US state sales tax rate reference. Runs in your browser.
• Savings Goal Calculator
  Calculate how long it takes to reach a savings goal, or find out how much you need to save monthly. Enter your target, starting balance, and interest rate.
• Self-Employment Tax Calculator (SE Tax 2024–2025)
  Calculate your US self-employment (SE) tax, covering Social Security and Medicare, plus estimated federal income tax. Includes the SE deduction, quarterly payment estimates, and Additional Medicare Tax.
• Stock Cost-Basis / Averaging Calculator
  Calculate the average cost basis across multiple stock purchases and see your current gain or loss.
• Stock Split Calculator
  Calculate new share count and price after a stock split or reverse split.
• Subscription Cost Analyzer - Monthly & Annual True Cost
  Track all your subscriptions and see the true monthly and annual total. Add Netflix, Spotify, gym, cloud storage and more. Shows cost per day, per category, and total annual spend.
• Tip Calculator
  Calculate tip, total, and per-person split from a bill amount.
• Unit Price Calculator - Compare Price Per Unit
  Compare the price per unit of up to 6 products side by side. Enter a price and quantity for each item to instantly see which option gives the best value for money.
• US Tax Bracket Estimator - 2024 Federal Income Tax Calculator
  Estimate your 2024 US federal income tax using official IRS brackets. See your marginal rate, effective rate, and a full bracket breakdown. Free, instant, no sign-up.
• Zakat Calculator - Calculate Your Annual Zakat Obligation
  Calculate your annual Zakat obligation. Enter your zakatable assets, liabilities, and current gold/silver prices. Automatically checks the nisab threshold and computes the 2.5% due.

Percentages, fractions, statistics, geometry, and number theory.

• 3D Shape Calculator - Volume & Surface Area
  Calculate volume and surface area for 3D shapes including sphere, cube, rectangular prism, cylinder, cone, and regular tetrahedron.
• Big Number Calculator - Arbitrary Precision Integers
  Perform exact arithmetic on integers of any size with no floating-point rounding. Supports addition, subtraction, multiplication, division, modulo, power, GCD, LCM, and factorial up to 10 000!.
• Birthday Paradox Calculator - Group Size & Collision Probability
  Calculate the probability that at least two people in a group share a birthday. See why just 23 people gives a 50% chance and visualize the probability curve.
• Bitwise Calculator - AND, OR, XOR, NOT, Shift Operations
  Perform bitwise AND, OR, XOR, NOT, left shift, and right shift operations with 32-bit visualization. Input decimal, hex (0x), or binary (0b) values.
• Circle Calculator - Area, Circumference, Arc Length & Sector
  Calculate circle area, circumference, diameter, arc length, sector area, chord length, and segment area. Enter any one property and get all others instantly.
• Collatz Conjecture Sequence Visualizer - 3n+1 Problem
  Visualize the Collatz sequence for any positive integer. See the hailstone trajectory, step count, and peak value. Explore the famous 3n+1 conjecture.
• Complex Number Calculator - Add, Multiply, Modulus & More
  Perform arithmetic on complex numbers: add, subtract, multiply, divide, raise to a power, square root, modulus, conjugate, inverse, exp, and ln. Step-by-step shown.
• Confidence Interval Calculator
  Calculate confidence intervals at 90%, 95%, or 99% using z or t distributions.
• Continued Fraction Converter - Best Rational Approximations
  Convert any decimal or fraction to its continued fraction representation [a₀; a₁, a₂, …]. Shows all convergents, which are the best rational approximations to any real number.
• Conway's Game of Life - Cellular Automaton Simulator
  Simulate Conway's Game of Life in your browser. Start from a random seed, draw your own pattern, or load a classic preset like the glider. Watch evolution unfold.
• Decimal to Fraction Converter - Terminating & Repeating
  Convert any decimal to a simplified fraction. Supports terminating decimals, repeating decimals (e.g. 0.(3) = 1/3), and mixed-number form.
• Derivative Calculator - Symbolic Differentiation
  Calculate the derivative of any polynomial, trigonometric, exponential, or logarithmic expression. Supports chain rule, product rule, and quotient rule with step-by-step output.
• Dice Probability Calculator - RPG Dice Odds & Distribution
  Calculate the full probability distribution for any dice roll in XdY+modifier notation. See the chance of rolling at least N, the mean, standard deviation, and a bar chart of outcomes.
• Distance Formula Calculator - 2D and 3D Distance Between Two Points
  Calculate the distance between two points in 2D or 3D space. Shows the substituted distance formula with step-by-step work.
• Ellipse Calculator - Area, Perimeter, Eccentricity & Foci
  Calculate ellipse area, perimeter (Ramanujan approximation), eccentricity, linear eccentricity, semi-latus rectum, and focal distance.
• Fibonacci Sequence Generator - First N, Nth Term & Range
  Generate Fibonacci numbers three ways: list the first N terms, look up the exact Nth Fibonacci number (up to F(10,000) using BigInt), or find all Fibonacci numbers within a range.
• Final Grade Calculator
  Find out what score you need on your final exam to achieve your desired course grade.
• Fourier Series Visualizer - Square, Sawtooth & Triangle Waves
  See how adding sine wave harmonics builds square, sawtooth, and triangle waves. Animate the rotating phasor vectors and watch the Fourier approximation improve with more terms.
• Fraction Calculator
  Add, subtract, multiply, and divide fractions or mixed numbers. Shows simplified result, mixed-number form, and decimal equivalent.
• Function Grapher - Interactive f(x) Graph Plotter
  Plot any mathematical function f(x) interactively in your browser. Supports trig, logarithms, exponents, and more. Pan and zoom with mouse or touch.
• GCD & LCM Calculator - Greatest Common Divisor & Least Common Multiple
  Calculate the greatest common divisor (GCD) and least common multiple (LCM) of up to 50 integers. Shows step-by-step Euclidean algorithm work and prime factorization.
• GPA Calculator
  Calculate your cumulative GPA from course grades and credit hours. Supports 4.0, 4.5 (honors), and 5.0 (AP) scales. Saves automatically.
• Integral Calculator - Symbolic & Definite Integration
  Calculate indefinite and definite integrals instantly. Supports polynomials, sin, cos, exp, ln, and sqrt with step-by-step antiderivatives. Definite integrals evaluated numerically for complex expressions.
• Linear Regression Calculator - Slope, Intercept & R^2
  Compute least-squares linear regression for a set of (x, y) data points. Get the slope, intercept, R^2 coefficient of determination, Pearson correlation, and a scatter plot with the best-fit line.
• Linear System Solver - 2×2 and 3×3 Equations
  Solve systems of 2 or 3 linear equations with step-by-step Gaussian elimination. Detects unique solutions, no solution (inconsistent), and infinite solutions (dependent).
• Logarithm & Exponent Calculator
  Calculate log base b, natural log, log₁₀, powers, and eˣ quickly.
• Magic Square Generator - Odd & Even Order Magic Squares
  Generate magic squares where every row, column, and diagonal sums to the same magic constant. Supports odd orders (3, 5, 7, 9, 11) and doubly-even orders (4, 8, 12).
• Mandelbrot & Julia Set Fractal Explorer - Interactive Canvas
  Explore the Mandelbrot set and Julia sets interactively in your browser. Zoom in to reveal infinite fractal detail. Switch between Mandelbrot and Julia modes.
• Matrix Calculator - Add, Multiply, Inverse, Determinant & More
  Perform matrix operations online: addition, subtraction, multiplication, transpose, determinant, inverse, rank, and trace. Up to 10×10 matrices with step-by-step solutions.
• Midpoint & Distance Calculator - Two-Point Formula
  Find the midpoint, distance, and slope between two points (x₁,y₁) and (x₂,y₂) instantly with step-by-step solutions.
• Modular Arithmetic Calculator - Mod, Power, Inverse & CRT
  Perform modular arithmetic operations: basic mod, fast modular exponentiation, modular inverse (extended Euclidean), Bézout coefficients, and Chinese Remainder Theorem.
• Number Theory Explorer - Perfect, Abundant & Amicable Numbers
  Explore number theory concepts: perfect numbers, abundant numbers, amicable pairs, prime factorization, and divisors - all calculated instantly in your browser.
• Number to Words Converter - Cardinal, Ordinal & Check Writing
  Convert any number to its English word form: cardinal (one thousand), ordinal (one thousandth), or check-writing format. Supports numbers up to 10^21 with decimals.
• Ohm's Law Calculator - Voltage, Current, Resistance & Power
  Solve V=IR and P=VI for any two unknowns. Enter any two of voltage, current, resistance, or power to compute the other two.
• Pascal's Triangle Generator - Rows, Binomial Coefficients
  Generate Pascal's Triangle up to 25 rows. Highlights diagonals (natural numbers, triangular numbers, Fibonacci), shows binomial coefficients, and lets you download the table.
• Percentage Calculator
  Calculate percentages four ways: find a percentage of a number, find what percent X is of Y, find the base value, or calculate percent change.
• Permutations & Combinations Calculator - nPr and nCr
  Calculate permutations P(n,r) and combinations C(n,r) with step-by-step factorial work. Uses BigInt for large values.
• Poker Odds Calculator - 5-Card Hand Probabilities
  Look up the exact probability of every 5-card poker hand (Royal Flush through High Card) from a standard 52-card deck. Also classify any 5-card hand you enter.
• Polygon Calculator - Area, Perimeter, Angles & Diagonals
  Calculate properties of any regular polygon: area, perimeter, interior and exterior angles, number of diagonals, inradius, and circumradius.
• Polynomial Solver - Roots of Degree 2, 3, and 4
  Solve polynomial equations of degree 2, 3, or 4 instantly. Enter coefficients to find all real and complex roots using exact algebraic formulas (quadratic, Cardano, Ferrari).
• Prime Number Tools - Primality Test, Factorization & Sieve
  Three prime number tools in one: test if a number is prime, find its prime factorization, and generate all primes up to 10 million with the Sieve of Eratosthenes.
• Probability Calculator - Single, Complement, And, Or
  Calculate basic probability: single events, complements, P(A or B), and P(A and B). Results shown as fraction, decimal, and percentage.
• Probability Distribution Calculator - Normal, Binomial & Poisson
  Calculate PDF, PMF, and CDF values for the Normal, Binomial, and Poisson probability distributions. Visualize the distribution curve instantly in your browser.
• Pythagorean Theorem Calculator - Find Side or Check Triple
  Use the Pythagorean theorem (a² + b² = c²) to find the hypotenuse or a missing leg, or check whether three numbers form a Pythagorean triple.
• Quadratic Equation Solver
  Solve ax² + bx + c = 0. Shows real or complex roots, discriminant, vertex, and step-by-step solution.
• Ratio & Proportion Solver
  Simplify ratios and solve proportions (A:B = C:?) for the missing value.
• Right Triangle Calculator - Find Missing Sides & Angles
  Calculate any unknown side or angle of a right triangle. Enter any two values and get the complete solution using the Pythagorean theorem and trigonometry.
• Roman Numeral Converter - Arabic ↔ Roman Numerals
  Convert between Arabic numbers and Roman numerals instantly. Supports 1 to 3,999,999. Runs entirely in your browser.
• Scientific Calculator - sin, cos, log, sqrt & More
  Free online scientific calculator with trig functions, logarithms, exponents, factorials, and constants π and e. Degrees and radians. History panel.
• Scientific Notation Converter - Standard, Scientific, Engineering & E-Notation
  Convert any number between standard decimal, scientific notation (a × 10^b), engineering notation, and E-notation. Set significant figures and copy any form instantly.
• Sequence Detector - Identify Number Patterns & Predict Next Terms
  Paste a number sequence and instantly identify its pattern: arithmetic, geometric, Fibonacci, squares, cubes, triangular, primes, and more. Predicts the next 5 terms with the formula.
• Significant Figures Calculator
  Count the significant figures in a number and round any value to N significant figures.
• Slope Calculator - Find Slope, Equation & Distance Between Two Points
  Calculate the slope, y-intercept, line equation, distance, and angle between two points. Shows slope-intercept form y = mx + b instantly.
• Spirograph & Lissajous Curve Generator - Geometric Art Visualizer
  Generate beautiful spirograph (hypotrochoid) and Lissajous curves in your browser. Adjust inner/outer circle radii, pen distance, and frequency ratios to create endless geometric patterns.
• Statistics Calculator
  Calculate mean, median, mode, standard deviation, variance, quartiles, and IQR from any list of numbers.
• Tower of Hanoi - Step-by-Step Puzzle Solver & Visualizer
  Watch the Tower of Hanoi puzzle solve itself step by step with animated discs. Choose up to 8 discs, auto-play or step manually, and learn the recursive algorithm.
• Triangle Solver - Solve Any Triangle (SSS, SAS, ASA, AAS, SSA)
  Solve any triangle by entering three known values. Supports SSS, SAS, ASA, AAS, and the ambiguous SSA case. Shows all sides, angles, area, and perimeter.
• Trigonometry Solver
  Calculate sin, cos, tan, inverse trig, and hyperbolic functions in degrees or radians.
• Truth Table Generator
  Generate truth tables for any Boolean expression using AND, OR, NOT, XOR, NAND, NOR, and XNOR operators.
• Unit Circle Reference
  Interactive unit circle reference showing sin, cos, and tan values for all 17 standard angles.
• Vector Calculator - Add, Dot Product, Cross Product & More
  Perform 2D and 3D vector operations: addition, subtraction, dot product, cross product, magnitude, normalization, and angle between vectors. Step-by-step solutions shown.
• Venn Diagram Generator - Set Operations Visualizer (2 or 3 Sets)
  Create interactive Venn diagrams for 2 or 3 sets. Enter items, see union, intersection, difference, and symmetric difference calculated instantly with a visual SVG diagram.
• Z-Score Calculator
  Calculate the z-score and percentile for any value given a mean and standard deviation.

Body composition, fitness, and pace calculators.

• A1C ↔ Blood Glucose Converter
  Convert between HbA1c percentage and estimated average glucose (eAG) in mg/dL or mmol/L using the ADA formula.
• Baby Formula & Infant Feeding Amount Calculator
  Calculate how much formula to feed your baby based on age and weight using standard pediatric guidelines (150 ml/kg/day). Covers newborn to 12 months.
• BAC Calculator - Blood Alcohol Content Estimator
  Estimate your blood alcohol content (BAC) using the Widmark formula. Enter drinks, weight, sex, and hours drinking for an instant BAC estimate.
• Biological Age Estimator - Lifestyle-Based Age Calculator
  Estimate your biological age based on lifestyle factors including BMI, blood pressure, exercise, sleep, diet, smoking status, and alcohol intake. See how your habits add or subtract years.
• Blood Pressure Category Checker - AHA/ACC Guidelines
  Enter your systolic and diastolic blood pressure to see your AHA/ACC category: Normal, Elevated, Stage 1 or Stage 2 Hypertension, or Hypertensive Crisis.
• BMI Calculator
  Calculate Body Mass Index in metric or imperial. WHO classification and healthy weight range.
• BMR / TDEE Calculator
  Calculate your Basal Metabolic Rate and Total Daily Energy Expenditure using Mifflin-St Jeor or Harris-Benedict.
• Body Fat Percentage Calculator
  Calculate your body fat percentage using the US Navy circumference method. Supports metric and imperial, shows ACE classification and lean body mass. Free and private.
• Body Frame Size Calculator - Small, Medium, or Large Frame?
  Determine your body frame size (small, medium, or large) using the wrist circumference method. See your frame-adjusted ideal weight range.
• Box Breathing / Breathing Exercise Guide
  Guided breathing exercises with animated circle. Choose from box breathing, 4-7-8, resonance, and more. Reduce stress and improve focus.
• Calorie Burn Calculator - Calories Burned by Activity
  Calculate how many calories you burn during exercise or daily activities. Enter your weight, activity type, and duration to get an instant estimate based on MET values.
• Calorie Tracker - Daily Food Log & Calorie Counter
  Track your daily calorie intake with a simple food log. Set a daily calorie goal, add meals and snacks, and see how much you have left for the day.
• Child Growth Percentile Calculator (WHO/CDC)
  Calculate your child's weight and height percentile based on WHO/CDC reference data for ages 0-18 years. See where your child falls compared to the reference population.
• Cycling FTP Training Zones Calculator
  Calculate your 7 cycling training zones from your Functional Threshold Power (FTP). Enter your FTP or estimate it from a 20-minute test to get power ranges for each zone.
• Cycling Power / Speed Calculator
  Calculate cycling power output (watts), speed, distance, or time using a physics-based model. Includes FTP power zones.
• Daily Water Intake Calculator - How Much Water Should You Drink?
  Calculate your personalized daily water intake based on body weight, activity level, and climate. Get recommendations in liters, cups, and ounces.
• Glycemic Load Calculator - GL & GI for Any Food
  Calculate the Glycemic Load (GL) of any food using its Glycemic Index (GI), carbohydrate content, and fiber. Includes a reference table of common foods.
• Habit Tracker - Daily Habit Tracker with Streak Counter
  Track daily habits with a visual grid, streak counter, and localStorage persistence. Add habits, mark completions, and watch your streaks grow. No account required.
• Heart Rate Zone Calculator
  Calculate your 5 training heart rate zones (Z1–Z5) from your age and resting heart rate. Supports Classic, Tanaka, and Karvonen methods. Free and private.
• Heat Index Calculator - Real-Feel Temperature & Safety
  Calculate the heat index (feels-like temperature) using the NWS Rothfusz equation. Enter temperature and relative humidity to get the apparent temperature and heat safety warnings.
• Ideal Weight Calculator - Devine, Robinson, Miller & Hamwi Formulas
  Calculate your ideal body weight using four evidence-based formulas (Devine, Robinson, Miller, Hamwi) plus a BMI-based healthy weight range.
• Intermittent Fasting Timer - 16:8, 18:6, OMAD Schedules
  Plan your intermittent fasting schedule with a visual countdown timer. Supports 16:8, 18:6, 20:4, and OMAD protocols. Set your fast start time and track your eating window.
• Lean Body Mass Calculator - Boer, James & Hume Formulas
  Calculate lean body mass (LBM) using the Boer, James, and Hume formulas from weight and height. Includes fat-free mass estimate for male and female.
• Macro Calculator
  Calculate daily protein, carbs, and fat grams from your calorie target using common macro splits.
• One-Rep Max Calculator
  Estimate your one-rep max (1RM) from any weight and rep count using five formulas (Epley, Brzycki, Lombardi, O'Conner, Wathan). Includes a rep-weight table. Free and private.
• Ovulation Calculator - Predict Your Fertile Window
  Predict your ovulation date and fertile window based on your last period and cycle length. See up to 6 cycles at once. Free, private, no sign-up.
• Pace Calculator
  Calculate running pace, finish time, or distance. Enter any two values and get the third, plus split times for 5K, 10K, half marathon, and marathon. Free and private.
• Period & Cycle Tracker - Predict Next Period & Fertile Window
  Track your menstrual cycle, predict your next period, ovulation date, and fertile window. All data stays in your browser.
• Pet Age Calculator - Dog & Cat Years to Human Years
  Convert your dog or cat's age to the equivalent human years. Accounts for breed size (small, medium, large, giant dogs) and follows AKC / AAFP age conversion guidelines.
• Pet Food Calculator: Daily Portions for Dogs & Cats
  Calculate how much to feed your dog or cat each day based on weight, activity level, and life stage. Uses the standard veterinary RER/MER energy formula.
• Pregnancy Due Date Calculator
  Calculate your estimated due date from your last period, conception date, ultrasound, or IVF transfer. Shows gestational age, trimester, and key milestones. Free and private.
• Pregnancy Weight Gain Calculator (IOM Guidelines)
  Calculate recommended pregnancy weight gain based on pre-pregnancy BMI using IOM (Institute of Medicine) 2009 guidelines. Track whether you are on track each trimester.
• Race Time Predictor - Predict Finish Times Using Riegel's Formula
  Predict your finish time for any race distance based on a known race result. Uses Riegel's formula for 5K, 10K, half marathon, marathon, and more.
• Running Cadence & Stride Length Calculator
  Calculate your running stride length from cadence (steps per minute) and pace, or find the cadence needed for a target stride length. Improve running efficiency.
• Sleep Cycle Calculator - Best Time to Wake Up or Go to Bed
  Calculate optimal wake-up or bedtimes based on 90-minute sleep cycles. Wake between cycles to feel refreshed. Choose from 3 to 6 complete cycles.
• Sleep Quality Journal & Pattern Logger
  Log your bedtime, wake time, and sleep quality each day. Track average sleep duration and quality trends over time. All data is stored locally in your browser.
• SPF Sunscreen Calculator - Burn Time & Protection Duration
  Calculate how long sunscreen protects your skin based on your Fitzpatrick skin type, SPF rating, and UV index. See how much sunscreen to apply and when to reapply.
• Standard Drinks & Alcohol Units Calculator (UK & US)
  Calculate UK alcohol units and US standard drinks for any drink. Enter volume and ABV, or pick from common drink presets. Includes low-risk drinking guidelines.
• Steps to Distance Calculator - Convert Steps to Miles or Km
  Convert step count to distance in km, miles, meters, or feet, or find out how many steps you need to walk a given distance. Estimates stride length from your height and gender.
• Sweat Rate & Hydration Calculator for Athletes
  Calculate your personal sweat rate and post-exercise rehydration target. Weigh yourself before and after a workout to get a precise fluid replacement plan.
• Swim Pace Calculator
  Calculate swim pace per 100m or 100y, total swim time, or distance. Supports pool and open-water distances.
• Treadmill Pace Converter - Speed to Pace, mph to km/h
  Convert treadmill speed (km/h or mph) to running pace (min/km or min/mile) and back. Includes incline grade-adjusted pace calculation.
• UV Index Calculator - Burn Time, Vitamin D & SPF Guide
  Enter the UV index and your Fitzpatrick skin type to calculate safe sun exposure time, vitamin D production time, and the recommended SPF sunscreen rating.
• VO2 Max Calculator - Estimate Aerobic Fitness
  Estimate your VO₂ max from the Cooper 12-minute run, 1.5-mile run, or Rockport 1-mile walk test. Includes ACSM fitness category rating.
• Waist-to-Height Ratio Calculator - Cardiovascular Risk
  Calculate your waist-to-height ratio (WHtR) to assess cardiovascular and metabolic health risk. Research shows WHtR may be a better predictor of health risk than BMI alone.
• Waist-to-Hip Ratio Calculator - WHR Health Risk
  Calculate your waist-to-hip ratio (WHR) and see your cardiovascular health risk category (low, moderate, high) according to WHO guidelines. Supports inches and centimetres.
• Wilks Score Calculator - Powerlifting Strength Comparison
  Calculate your Wilks score to compare powerlifting strength across different body weights. Enter body weight and total (squat + bench + deadlift).
• Wind Chill Calculator - Feels-Like Temperature & Frostbite Risk
  Calculate the wind chill temperature using the NWS formula. Enter air temperature and wind speed to get the feels-like temperature, frostbite risk time, and safety recommendations.
• Workout Volume Calculator - Sets × Reps × Weight
  Calculate total workout volume (sets × reps × weight) for each exercise and your full session. Track total tonnage and estimated one-rep max.

Timezones, age, durations, countdowns, and timers.

• Add or Subtract Days from a Date
  Add or subtract days, weeks, months, years, hours, or minutes from any date and see the resulting date instantly.
• Age Calculator
  Calculate your exact age in years, months, and days. See total days, weeks, hours, next birthday countdown, zodiac sign, and day of week you were born.
• Birthday Countdown - Days Until Your Next Birthday
  Find out exactly how many days until your next birthday, what age you will be, and what day of the week your birthday falls on. Free, instant, no sign-up required.
• Chinese Zodiac Calculator - Find Your Animal Sign & Element
  Find your Chinese zodiac animal sign, element, and Yin/Yang energy from your birth year. Includes personality traits, lucky colors, lucky numbers, and compatible signs.
• Countdown Timer - Free Online Countdown to Any Date
  Count down to any future event: a New Year, vacation, product launch, or deadline. Live days, hours, minutes, and seconds. Save multiple countdowns and share via link. Runs in your browser.
• Day of the Week Calculator - What Day Was Any Date?
  Find out what day of the week any date falls on. Shows the day name, week number, day of year, quarter, and more. Also find the next occurrence of any weekday.
• Days Between Dates
  Calculate the exact number of days, weeks, months, and years between two dates. Toggle weekdays-only and include/exclude the end date.
• Days-Since / Sobriety Counter
  Track how many days, weeks, months, and years have passed since any date. Perfect for sobriety, quit dates, and personal milestones.
• Easter Date Calculator - Find Easter Sunday for Any Year
  Calculate the date of Easter Sunday for any year using the Anonymous Gregorian (Butcher's) algorithm. Supports Gregorian and Julian calendar traditions.
• Equinox & Solstice Date Calculator - Astronomical Seasons
  Calculate the precise dates and times of the March equinox, June solstice, September equinox, and December solstice for any year from 1000 to 3000, using Jean Meeus astronomical algorithms.
• Fiscal Quarter & Period Calculator
  Find the fiscal quarter, fiscal year, and days remaining for any date. Supports custom fiscal year start months (e.g. April for UK, October for US federal).
• Generation Finder - What Generation Am I?
  Enter your birth year to find out which generation you belong to - Gen Z, Millennial, Gen X, Baby Boomer, Silent Generation, or Gen Alpha - along with defining events and characteristics.
• Golden Hour & Blue Hour Photography Calculator
  Calculate sunrise, sunset, golden hour, and blue hour times for any location and date. Perfect for photographers wanting to plan the perfect shot at the best natural light.
• Great Circle / Haversine Distance Calculator
  Calculate the great-circle distance between two points on Earth using the Haversine formula. Returns distance in km and miles, initial bearing, and the geographic midpoint.
• Hebrew Calendar Converter - Jewish Date to Gregorian
  Convert dates between the Hebrew (Jewish) calendar and the Gregorian calendar. Supports leap years with Adar I & II and all 12/13 Hebrew months.
• Hijri Calendar Converter - Islamic Date to Gregorian
  Convert dates between the Hijri (Islamic) calendar and the Gregorian calendar. Uses the tabular Islamic calendar algorithm. Works entirely offline in your browser.
• Holiday Countdown - Days Until the Next Holiday
  Count the days until every major holiday. See upcoming holidays sorted by how soon they arrive, all calculated locally in your browser.
• ICS Calendar Event Generator
  Create and download ICS (iCalendar) files for any event. Compatible with Google Calendar, Outlook, Apple Calendar, and any RFC 5545 calendar app.
• ISO Week Number Calculator
  Find the ISO 8601 week number for any date. See the week year, day of the week, and the exact Monday-Sunday date range for the selected week.
• Julian Date Converter - Gregorian to Julian Day Number
  Convert between Gregorian calendar dates and Julian Day Numbers (JDN / JD). Also shows the equivalent Julian calendar date and Modified Julian Date (MJD).
• Leap Year & Days-in-Month Checker
  Check if any year is a leap year, see the number of days in each month, find the next and previous leap years, and explore why 1900 was not a leap year.
• Life Calendar - Weeks of Life Visualizer
  Visualize your life as a grid of weeks. Enter your birth date and life expectancy to see which weeks have passed and how many remain - inspired by the famous "Your Life in Weeks" concept.
• Lunar Phase Calculator - Moon Phase for Any Date
  Find the moon phase for any date. Shows the current lunar phase, illumination percentage, moon age, and the dates of the next new moon and full moon.
• Multi-Timezone Meeting Planner
  Plan meetings across multiple cities and timezones. Visual overlap grid shows working hours for every participant. Download .ics or share a link.
• Pomodoro Timer - Free Online Focus Timer
  A fully configurable Pomodoro timer with 25-minute work sessions, short breaks, and long breaks. Audio chime, browser notifications, and daily pomodoro count. Runs in your browser.
• Stargazing Planner - Planet Visibility Calculator
  Check when Mercury, Venus, Mars, Jupiter, and Saturn are visible in the sky. Uses simplified orbital mechanics to predict planet elongation and visibility.
• Stopwatch - Free Online Stopwatch with Lap Timer
  Free online stopwatch with millisecond precision, lap recording, best/worst lap highlighting, and CSV export. Start, stop, lap, and reset. Runs entirely in your browser.
• Sunrise & Sunset Calculator - Sun Times for Any Location
  Calculate sunrise, sunset, and solar noon for any latitude and longitude. Supports any UTC offset and detects polar day/night.
• Tidal Prediction Calculator - Tidal Harmonic Model
  Predict tidal heights using a simplified harmonic model based on the major lunar and solar tidal constituents. View a 48-hour tide curve and find high/low tide times.
• Time Card Calculator - Track Work Hours & Overtime
  Calculate total work hours from clock-in and clock-out times. Add breaks, track overtime, and get a weekly summary. Supports overnight shifts.
• Time Duration Calculator - Add, Subtract & Multiply Durations
  Add, subtract, multiply, divide, or average a list of HH:MM:SS durations without calendar dates. Get results in HH:MM:SS, total seconds, minutes, and decimal hours.
• Timezone Converter - Convert Time Between Time Zones
  Convert any date and time between multiple time zones instantly. Shows UTC offset, DST status, and day/night indicator. Uses the full IANA timezone database. Runs in your browser.
• Unix Timestamp Converter - Epoch Time to Date & Back
  Convert Unix timestamps (epoch time) to human-readable dates and back. Auto-detects seconds vs milliseconds. Shows ISO 8601, RFC 2822, UTC, and local time. Live current timestamp for developers.
• Wedding Anniversary Calculator - Gifts by Year
  Enter your wedding date to find out how many years you have been married and discover the traditional and modern gift themes for each anniversary year.
• Work Anniversary & Tenure Calculator
  Calculate how long you have worked at a job - in years, months, and days - and find out when your next work anniversary is.
• Working Days Calculator
  Count the number of business days between two dates, excluding weekends and public holidays for the US, UK, or Canada.
• World Clock - Live Time in Every Timezone
  See the current time in multiple cities and timezones simultaneously. Live-updating clocks with date, UTC offset, and DST indicator. Add your own zones, saved automatically to your browser.
• Zodiac Sign Calculator - Find Your Western Astrology Sign
  Find your Western zodiac (astrological) sign from your birth date. See personality traits, element, modality, ruling planet, and strengths and weaknesses.

Password generators, hashes, ciphers, and crypto utilities.

• AES Encrypt / Decrypt Online (AES-256-GCM)
  Encrypt and decrypt text in your browser using AES-256-GCM and PBKDF2. Everything stays on your device.
• Caesar Cipher - Encode, Decode & Brute-Force
  Encode or decode text with the Caesar cipher. Set any shift from 1 to 25, or use brute-force mode to try all 25 possible shifts at once. Great for puzzles.
• File Hash Calculator - SHA-256, SHA-512, SHA-1 Checksum
  Calculate SHA-1, SHA-256, SHA-384, and SHA-512 hashes for any file. Drag and drop to verify file integrity. All processing happens locally in your browser.
• Hash Generator - MD5, SHA-1, SHA-256, SHA-384, SHA-512
  Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text or files, instantly, in your browser. Hex or Base64 output. Nothing uploaded anywhere.
• HMAC Generator (SHA-256 / SHA-512)
  Generate HMAC signatures online using HMAC-SHA-256, HMAC-SHA-512, HMAC-SHA-384, or HMAC-SHA-1. Enter a message and secret key. All computation happens in your browser.
• Passphrase Generator (Diceware)
  Generate strong Diceware passphrases using the EFF wordlist and Web Crypto randomness. Memorable, high-entropy, and never transmitted anywhere.
• Password Generator
  Generate strong random passwords using the Web Crypto API.
• Password Strength Checker
  Check the strength of any password locally: get an entropy estimate, crack time at four attack speeds, pattern warnings, and improvement tips. Nothing sent anywhere.
• ROT13 Encoder / Decoder
  Encode or decode ROT13 online instantly. ROT13 is self-inverse: apply it twice to restore the original text. Useful for hiding spoilers, puzzle answers, and obfuscating text.
• TOTP Code Generator (RFC 6238)
  Generate TOTP authentication codes from a Base32 secret (RFC 6238 compliant). Shows the current code, next code, and countdown timer. Everything runs in your browser.
• Vigenère Cipher - Encode & Decode Online
  Encode or decode text with the Vigenère cipher. Enter your text and a keyword; each letter shifts by the corresponding letter of the repeating keyword.

Counters, case converters, sorters, and text generators.

• Acrostic Poem Generator - Create Personalized Name Poems
  Create acrostic poems from any word or name. Each letter of your word begins a new line of the poem. Customize each line and copy the result.
• Anagram Solver - Find All Anagrams Instantly
  Find all anagrams and sub-anagrams of any word or phrase. Unscramble letters and discover hidden words. Works entirely in your browser.
• ASCII Text Art Generator
  Convert text to large ASCII art banners using block or slim font styles. Copy and paste into terminals or chat.
• Bionic Reading Converter - Bold-Prefix Speed Reading Tool
  Convert any text to Bionic Reading format: the first letters of each word are bolded to guide your eye and boost reading speed. Adjust the saccade level and copy the result as HTML.
• Braille Converter - Text to Unicode Grade-1 Braille
  Convert text to Grade-1 Braille Unicode characters and back. Visualize the 6-dot braille cell patterns for each letter. Supports a-z, 0-9, common punctuation.
• Case Converter
  Convert text to uppercase, lowercase, camelCase, PascalCase, snake_case, kebab-case, and 8 more case styles, all at once.
• Citation Generator - APA, MLA & Chicago Formatter
  Generate APA 7, MLA 9, and Chicago citations for books, journal articles, websites, and more.
• Emoji Picker - Browse & Copy Emojis
  Browse, search, and copy emojis by category. Includes smileys, people, animals, food, objects, symbols, and more.
• Extractive Text Summarizer - TF-IDF Key Sentence Extractor
  Automatically summarize long text by extracting the most important sentences using TF-IDF scoring. Adjust the number of sentences to keep and copy the summary.
• Fancy Text Generator - Strikethrough, Bold, Italic & More
  Convert text into bold, italic, strikethrough, small caps, upside-down, bubble, and 10+ Unicode styles. Copy any style instantly.
• Find and Replace
  Find and replace text online with support for case-sensitive, whole-word, and regex modes. Instantly replace all occurrences.
• HTML to Markdown Converter - Free Online Tool
  Convert HTML to Markdown instantly in your browser. Supports headings, lists, tables, links, images, code blocks, and more. No server, no signup.
• International Phone Number Formatter - E.164 & Local Formats
  Format phone numbers in E.164, national, and international formats. Supports 20+ countries including US, UK, Germany, Japan, India, and more.
• Leet Speak (1337) Converter - Text to L33T Translator
  Convert plain text to leet speak (1337) and back. Choose basic substitutions (4,3,1,0,5,7) or advanced mode with @ and more. Copy results instantly.
• Line Number Adder - Add Line Numbers to Text
  Add line numbers to any block of text. Choose the starting number, separator, padding, and whether to skip blank lines.
• Lorem Ipsum Generator
  Generate lorem ipsum placeholder text by words, sentences, paragraphs, or bytes. Classic Latin, hipster, corporate, and bacon variants.
• Markdown Editor with Live Preview
  Free online Markdown editor with live preview, toolbar shortcuts, multi-document tabs, and localStorage autosave. Export as .md or .html. No login required.
• Markdown to HTML Preview
  Live Markdown editor with instant HTML preview, including tables, task lists, code blocks, and GitHub Flavored Markdown. Copy the rendered HTML with one click.
• Mnemonic (First-Letter) Generator - Acronym Memory Aid
  Create mnemonic phrases from acronyms (e.g. ROYGBIV -> "River Oak Yellow") or extract an acronym from any sentence. Perfect for memorising lists, sequences, and study material.
• Morse Code Translator - Text to Morse and Back
  Instantly translate text to Morse code or decode Morse back to text. Supports all ITU letters, digits, and punctuation. Auto-detects direction.
• Name Generator
  Generate fantasy, sci-fi, medieval, and business names by combining syllable patterns. Great for characters and brands.
• NATO Phonetic Alphabet Converter - Spell Words Phonetically
  Convert any text to the NATO phonetic alphabet (Alpha, Bravo, Charlie…). Useful for spelling names or codes over the phone.
• Palindrome Checker & Generator - Test & Create Palindromes
  Check if any word, phrase, or sentence is a palindrome (reads the same forwards and backwards). Ignores spaces and punctuation. Also finds the longest palindromic substring and generates palindromes from a prefix.
• Pig Latin Translator - Convert English to Pig Latin
  Translate English text to Pig Latin instantly. Preserves capitalization and punctuation with configurable options.
• Random Word Generator
  Generate random nouns, verbs, adjectives, and adverbs. Filter by part of speech and copy all at once.
• Reading Level Estimator - Flesch-Kincaid, Fog, Coleman-Liau & More
  Check the reading level of any text using 5 readability formulas: Flesch-Kincaid, Gunning Fog, Coleman-Liau, SMOG, and ARI.
• Reading Time Estimator - How Long to Read Your Article
  Estimate how long it takes to read any text. Shows reading time for slow, average, fast, and speed readers based on word count. Also counts words, characters, and sentences.
• Remove Duplicate Lines
  Remove duplicate lines from text instantly. Case-sensitive or case-insensitive, with optional whitespace trimming. See counts of removed duplicates. Runs entirely in your browser.
• Reverse Text - Flip Characters, Words, or Lines
  Reverse text instantly by characters, words, lines, or per-line. Supports Unicode, emoji, and accented characters. Copy with one click.
• Rhyme Finder
  Find words that rhyme with any English word, grouped by rhyming suffix. Great for poetry and song lyrics.
• Slug Generator
  Convert any text to a clean URL slug. Choose hyphen, underscore, or dot separator. Transliterate accented characters, set max length. Free, runs in your browser.
• Sort Lines
  Sort lines of text alphabetically, numerically, by length, or randomly. Ascending or descending, case-insensitive or case-sensitive. All processing runs in your browser.
• Soundex & Metaphone Phonetic Name Matcher
  Check if two names sound the same using the Soundex and Metaphone phonetic algorithms. Useful for name deduplication, genealogy research, and fuzzy name matching.
• Speed Reading Trainer - RSVP Flash Card Reader
  Train yourself to read faster with Rapid Serial Visual Presentation (RSVP). Paste any text or pick a sample passage, set your WPM speed, and the trainer flashes one word at a time at your chosen pace.
• SWIFT / BIC Code Validator - Bank Identifier Code Checker
  Validate and decode SWIFT/BIC codes. See the breakdown of bank code, country, location code, and branch. Includes country name lookup for 60+ countries.
• Syllable Counter
  Count syllables in any word or passage of text. Useful for writing haiku, poetry, and song lyrics.
• Text Indenter / Dedenter - Add or Remove Indentation
  Add or remove indentation from every line of text. Choose spaces or tabs and set the indentation amount.
• Text Redactor - Mask & Remove PII from Text
  Auto-detect and mask emails, phone numbers, SSNs, credit cards, IP addresses, and more from any text. 100% client-side, so your data never leaves your browser.
• Text Similarity Calculator - Compare Two Texts
  Measure the similarity between two texts using Levenshtein distance, Jaccard, cosine, or overlap coefficient algorithms.
• Text Statistics - Word Count, Reading Time & More
  Analyze any text to get word count, character count, sentence count, reading time, speaking time, unique word count, and more.
• Text to Handwriting Converter
  Render typed text as a handwritten-style note on lined paper. Customize ink color and download as PNG.
• Text to Speech - Browser TTS Player
  Convert any text to speech using your browser's built-in TTS engine. Choose voice, rate, and pitch. Entirely client-side.
• Text Truncator - Truncate Text by Characters or Words
  Truncate any text to a set number of characters or words. Choose ellipsis position (end, middle, start) and word-boundary breaking.
• Title Case Converter
  Convert text to proper title case following AP or Chicago style guide rules for capitalization.
• Unslugify Tool - Convert Slugs to Human-Readable Text
  Convert URL slugs, file names, and kebab-case or snake_case identifiers into human-readable text. Choose title, sentence, lower, or UPPER output.
• Upside Down Text Generator
  Flip your text upside down using Unicode character substitutions. Copy the result for social media and chats.
• Username Generator
  Generate unique usernames by combining random adjectives and nouns. Choose camelCase, snake_case, kebab-case, or lowercase styles.
• Whitespace Cleaner - Remove & Fix Whitespace in Text
  Clean up whitespace in text: trim lines, collapse spaces, remove or collapse blank lines, and convert tabs to spaces.
• Word & Character Counter
  Count words, characters, sentences, and reading time. Updates as you type.
• Word Cloud Generator
  Paste text to generate a visual word cloud. Filter stop words, choose color themes, and download as SVG.
• Word Frequency Counter - Analyze Text Word Usage
  Analyze any text to find the most frequently used words. See word counts, percentages, unique word count, and filter out common stop words.
• Writing Prompt Generator
  Get random creative writing prompts across fantasy, sci-fi, romance, horror, mystery, and general fiction genres.
• Zalgo Text Generator
  Add creepy glitchy combining Unicode characters to your text to create Zalgo-style corrupted text effects.

Length, weight, temperature, volume, and other unit conversions.

• Angle Converter - Degrees, Radians, Gradians & More
  Convert angles between degrees, radians, gradians, turns, arcminutes, and arcseconds instantly.
• Area Converter
  Convert between square meters, square feet, acres, hectares, square miles, and more.
• Cooking Converter
  Convert cooking measurements: teaspoons, tablespoons, cups, milliliters, and more.
• Data Storage Converter
  Convert between bits, bytes, KB, MB, GB, TB, and IEC (KiB, MiB, GiB) units instantly.
• Energy Converter
  Convert energy between Joules, kJ, calories, kcal, Wh, kWh, BTU, foot-pounds, and electronvolts.
• Force Converter - Newtons, Pounds-force, Kilogram-force & More
  Convert force units between Newtons, kilonewtons, meganewtons, pound-force, kilogram-force, dynes, and kips instantly.
• Frequency Converter - Hz, kHz, MHz, GHz, RPM & More
  Convert frequency units between Hertz, kilohertz, megahertz, gigahertz, terahertz, RPM, and revolutions per second.
• Fuel Efficiency Converter - MPG, km/L, L/100km
  Convert fuel efficiency between US MPG, UK MPG, kilometres per litre (km/L), and litres per 100 km (L/100km).
• Latitude/Longitude Format Converter - DD, DMS, DDM
  Convert GPS coordinates between Decimal Degrees (DD), Degrees Minutes Seconds (DMS), and Degrees Decimal Minutes (DDM). Runs entirely in your browser.
• Length Unit Converter
  Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, nautical miles, and more. Instant bidirectional conversion. All calculations happen locally.
• Power Converter
  Convert power between watts, kilowatts, megawatts, horsepower (mechanical, metric, electrical), and BTU/h.
• Pressure Converter
  Convert pressure between Pa, kPa, MPa, bar, atm, psi, mmHg, inHg, and Torr instantly.
• Speed Converter
  Convert between mph, km/h, m/s, knots, and other speed units.
• Temperature Converter
  Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly. Includes common reference temperatures and an explanation of each scale. All calculations happen locally.
• Time Unit Converter
  Convert time between nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days, weeks, months, years, decades, and centuries.
• Torque Converter - N·m, ft·lbf, in·lbf & More
  Convert torque between Newton-metres, kilonewton-metres, foot-pounds, inch-pounds, inch-ounces, and kilogram-force metres.
• Volume Converter
  Convert between milliliters, liters, gallons, cups, fluid ounces, and more.
• Weight Unit Converter
  Convert between kilograms, pounds, ounces, stone, metric tons, troy ounces, carats, and more. Instant bidirectional conversion. All calculations happen locally.

Color converters, palette generators, contrast checkers, gradients.

• Border Radius Generator
  Set individual corner radii with sliders and see a live preview. Copy the CSS shorthand.
• Color Blindness Simulator
  Simulate how colors and images appear under protanopia, deuteranopia, tritanopia, and achromatopsia.
• Color Contrast Checker (WCAG)
  Check WCAG 2.x contrast ratio between any two colors. Instant pass/fail for AA and AAA levels across normal text, large text, and UI components.
• Color Hue Vision Test - FM100-Style Hue Discrimination
  Test your colour vision and hue discrimination with an FM100-inspired online test. Arrange coloured chips in order of hue - the lower your score, the better your colour perception.
• Color Mixer - Blend Two Colors Together
  Mix any two colors together using RGB, HSL, or pigment-style blending. Adjust the ratio and copy the result as hex, RGB, or HSL.
• Color Name Finder - Find the Nearest CSS Color Name
  Enter any hex, RGB, or CSS color and instantly find its exact or nearest CSS named color. See the 5 closest matches with swatches. Free, browser-only.
• Color Palette Generator
  Generate harmonic color palettes: complementary, analogous, triadic, tetradic, monochromatic, and split-complementary. Export as CSS variables or JSON.
• Color Picker & HEX RGB HSL Converter
  Pick a color visually or type any format: HEX, RGB, HSL, HSV, or CMYK. See all formats at once with copy buttons. Find the closest CSS named color and Tailwind shade. All processing is local.
• Color Reference Library - Browse & Search Named Colors
  Browse 130+ named CSS colors with hex, RGB, and HSL values. Filter by color group or search by name.
• Color Temperature Converter - Kelvin to RGB Color
  Convert color temperature in Kelvin to an RGB color value. Visualize warm candlelight, daylight, and cool sky temperatures.
• CSS Animation Generator
  Build CSS @keyframes animations visually and copy the generated CSS code.
• CSS Box Shadow Generator
  Visually build CSS box-shadow declarations with multiple layers. Adjust offsets, blur, spread, color, and opacity.
• CSS Button Generator - Custom Button Style Designer
  Design custom CSS buttons with live preview. Control background, text, hover colors, border-radius, padding, font size, shadows, and more. Generates clean HTML and CSS ready to paste.
• CSS clip-path Generator
  Generate CSS clip-path polygon values with a live visual editor. Copy the CSS instantly.
• CSS Filter Generator - Visual Filter Builder
  Visually adjust blur, brightness, contrast, grayscale, hue-rotate, invert, opacity, saturate, and sepia to generate a ready-to-use CSS filter property.
• CSS Gradient Generator
  Build CSS linear, radial, and conic gradients visually. Adjust color stops, angle, and position, then copy the ready-to-use CSS code.
• CSS Grid Generator
  Visually build CSS grid layouts. Define rows, columns, and gaps, then copy the generated CSS.
• CSS Loader Generator
  Generate pure-CSS loading spinners, dots, bars, and more. Copy the HTML and CSS.
• CSS Scroll Snap Playground - Interactive Demo
  Experiment with CSS scroll-snap-type, scroll-snap-align, and scroll-behavior in an interactive playground. Copy the generated CSS for your project.
• CSS Scrollbar Styler - Custom Scrollbar Generator
  Design a custom CSS scrollbar with live preview. Control width, track color, thumb color, hover color, and border-radius. Generates webkit and Firefox CSS ready to copy.
• CSS Toggle Switch Generator - Custom On/Off Switch
  Design a custom CSS toggle switch with live preview. Set track colors, thumb size, animation speed, and labels. Generates ready-to-use HTML and CSS with no JavaScript required.
• CSS Triangle / Arrow Generator - Pure CSS Shapes
  Generate pure CSS triangles and arrows in any direction without images or SVG. Adjust size, color, and direction, then copy the CSS class ready to paste into your stylesheet.
• Cubic Bezier Editor
  Drag control points to craft a cubic-bezier() curve and copy it for CSS transitions and animations.
• Flexbox Playground
  Experiment with all CSS flexbox properties in a live playground. Copy the generated CSS.
• Glassmorphism Generator
  Create glassmorphism CSS effects with blur, opacity, and saturation controls. Copy the CSS.
• Mesh Gradient Generator - CSS Gradient Builder
  Create beautiful mesh, conic, radial, and linear CSS gradients in your browser. Pick colors, adjust positions, and copy the generated CSS.
• Neumorphism Generator
  Generate neumorphic CSS box-shadow effects with live preview. Copy the CSS.
• SVG Blob Generator
  Generate random organic blob shapes as SVG or CSS clip-path. Copy for use in designs.
• SVG Pattern Generator
  Generate repeating SVG patterns (dots, lines, grids, etc.) as background tiles. Copy the SVG.
• Tints & Shades Generator - Color Scale Tool
  Generate tints (lighter) and shades (darker) of any color. Copy hex codes for full color scales. Perfect for design systems and CSS custom properties.

Formatters, validators, encoders, and reference tools for developers.

• .editorconfig Generator
  Generate .editorconfig files with global settings and per-file-type overrides. Copy the output.
• .gitignore Generator - Create .gitignore Files Instantly
  Generate .gitignore files for Node, Python, Java, Go, Rust, and 15+ languages, frameworks, and IDEs.
• ARIA Role & Landmark Reference - Accessibility Attribute Guide
  Browse all 50+ WAI-ARIA roles with descriptions and HTML examples. Filter by category (Landmark, Widget, Document) or search by name to find the right role for accessible UI.
• ASCII Table - Full Character Reference (0–127)
  Complete, searchable ASCII character table. Look up any character by decimal, hex, octal, binary, abbreviation, or description. Includes control characters, escape sequences, and printable characters.
• Aspect Ratio Calculator - Find, Simplify & Compare Ratios
  Find a missing width or height from an aspect ratio, simplify any W×H pair to its simplest ratio, or compare two sets of dimensions. Includes presets for 16:9, 4:3, 21:9, and more.
• Barcode Generator - Create Code 128, EAN-13, UPC-A Barcodes
  Generate 1-D barcodes in Code 128, Code 39, EAN-13, EAN-8, and UPC-A formats. Preview as SVG, download as PNG. All processing is done in your browser.
• Bcrypt Hash Generator & Verifier - Client-Side Password Hashing
  Generate bcrypt password hashes and verify passwords against existing hashes entirely in the browser. Supports cost factors 4-14. No data is sent to any server.
• Box Drawing Generator - ASCII/Unicode Boxes & Tables
  Generate Unicode box-drawing frames, borders, and ASCII tables. Choose from single, double, rounded, and bold styles. Copy the result for use in terminal output or documentation.
• Browser Storage Inspector - localStorage & sessionStorage Viewer
  View, add, edit, and delete localStorage and sessionStorage entries in your browser. See the byte size of each key, total storage usage, and switch between storage types.
• chmod Calculator - Unix File Permission Generator
  Calculate Unix file permissions visually. Toggle read/write/execute bits for owner, group, and other and get the octal code and chmod command.
• Cookie Parser
  Parse Set-Cookie headers and Cookie request headers into structured attribute tables.
• Cron Expression Builder / Explainer
  Build or decode cron expressions. Type an expression for a plain-English explanation and next 10 run times. Or use the visual builder to create one field by field.
• CSS @media Query Builder - Viewport & Breakpoint Tester
  Build CSS @media queries visually. Set min/max width, height, orientation, prefers-color-scheme, and more. Preview the result and test against your current viewport.
• CSS 3D Transform Generator - Rotate, Scale, Skew & Perspective
  Generate CSS 3D transform values visually. Rotate on X/Y/Z axes, scale, skew, translate, and add perspective. See a live preview and copy the generated CSS instantly.
• CSS Formatter & Minifier
  Beautify or minify CSS online. Adds indentation and line breaks, or strips whitespace for production, all in your browser. Nothing is uploaded.
• CSS Specificity Calculator - Understand Selector Weight
  Calculate and compare CSS selector specificity scores (a,b,c,d). See which rule wins and why, with support for :is(), :not(), :where(), and pseudo-elements.
• CSS Text Shadow Generator - Multi-Layer Shadow Builder
  Create CSS text-shadow effects with multiple layers. Adjust offset, blur, and color for each layer. Choose from presets like neon glow, emboss, and outline, then copy the generated CSS.
• CSS Transition & Easing Visualizer - Live Timing Curve Editor
  Visualize CSS transitions with an interactive easing curve. Choose a preset (ease, linear, ease-in, ease-out) or define a custom cubic-bezier, set duration and delay, and see the live animation.
• CSS Variable Extractor - Custom Property Inspector & Exporter
  Paste any CSS and instantly extract all custom properties (CSS variables). View them in a sortable table with their values and selectors, then export as a clean CSS snippet or CSV.
• CSV to JSON Converter
  Convert CSV to JSON instantly in your browser. Auto-detect delimiter, type inference, header row toggle, and full RFC 4180 quoting support.
• CSV Viewer & Editor
  Paste or upload CSV data to view it as a formatted table. Edit cells inline and download the modified CSV.
• cURL Command Builder - Build and Copy cURL Commands
  Visually build cURL commands without memorising flags. Set the HTTP method, URL, headers, body (JSON, form, raw), and authentication, then copy the ready-to-run command.
• Data URI Generator
  Convert text or files to Base64 data URIs for embedding directly in HTML, CSS, or JavaScript.
• Docker Compose Generator - Service Configuration Builder
  Build docker-compose.yml files visually. Add multiple services with images, ports, environment variables, volumes, depends_on, and restart policies, then copy the generated YAML.
• Env File Editor - Parse, Edit & Convert .env Files
  Parse .env files, view all key-value pairs in a clean table, add or edit entries, convert to/from JSON, and copy the result, all in your browser.
• Font Preview & Pairing Sandbox - System & Web-Safe Font Tester
  Preview system fonts and web-safe font stacks with custom text. Filter by category (serif, sans-serif, monospace, cursive, fantasy), adjust size and weight, and copy the font-family stack.
• Git Command Builder
  Browse and search all common Git commands with descriptions and flag references. Copy any command.
• GitHub Actions Workflow Builder - CI/CD YAML Generator
  Build GitHub Actions CI/CD workflows visually. Configure triggers, Node.js version, package manager, and pipeline steps, then get a ready-to-use .yml file.
• Hex Dump Viewer - Text or File to Hex and ASCII
  Display the hex dump of typed text or an uploaded file. Shows the byte offset, hexadecimal values, and printable ASCII representation in the classic xxd/od style.
• HTML Formatter & Beautifier
  Format and beautify HTML online. Adds indentation, fixes nesting, and optionally self-closes void elements, all in your browser. Nothing is uploaded.
• HTTP Header Analyzer - Inspect & Validate Headers
  Paste HTTP response headers to get instant explanations, security scoring, cookie flag checks, CSP analysis, and actionable recommendations, all offline.
• HTTP Status Codes - Complete Reference
  Searchable reference for all HTTP status codes: 1xx, 2xx, 3xx, 4xx, and 5xx. Find any code by number, name, or description. Includes IANA-registered and commonly used codes.
• IP Subnet Calculator
  Calculate IPv4 subnet properties from an IP + CIDR prefix. Get network address, broadcast, first/last host, subnet mask, wildcard mask, and binary breakdown.
• IPv6 Address Expander / Compressor - Full and Short IPv6 Notation
  Expand an abbreviated IPv6 address to its full 8-group notation, or compress a full address to its canonical short form. Validates IPv6 syntax including embedded IPv4 addresses.
• JavaScript Formatter & Minifier
  Beautify or minify JavaScript online. Format messy JS with proper indentation, or compress it for production. Runs entirely in your browser.
• JSON ↔ XML Converter - Bidirectional JSON and XML Conversion
  Convert JSON to XML or XML to JSON instantly in the browser. Handles nested objects, arrays, and proper XML entity escaping with a live side-by-side editor.
• JSON ↔ YAML Converter - Convert Between JSON and YAML
  Convert JSON to YAML or YAML to JSON instantly in your browser. Supports nested objects, arrays, and all scalar types. No data leaves your device.
• JSON Diff Viewer - Compare Two JSON Documents
  Compare two JSON objects side-by-side. Instantly see added, removed, changed, and unchanged keys, with support for deeply nested structures.
• JSON Formatter & Validator - Pretty Print, Minify, Validate
  Format, validate, and minify JSON instantly in your browser. Pretty-print with 2-space, 4-space, or tab indentation. Sort keys alphabetically. Parse errors shown with line and column.
• JSON Path Tester - Test JSONPath Expressions Online
  Test JSONPath expressions against any JSON document in real time. Supports dot notation, wildcards, recursive descent, array slices, and filter expressions.
• JSON Schema Validator - Validate JSON Online
  Validate any JSON document against a JSON Schema (Draft-07 subset) right in your browser. Supports type, required, properties, allOf/anyOf/oneOf, $ref, format checks, and more.
• JSON to CSV Converter
  Convert a JSON array of objects to CSV in your browser. Custom delimiter, quote-all, header toggle, and nested object flattening.
• JSON to TypeScript
  Paste JSON and instantly generate TypeScript interfaces with proper nested types.
• JWT Decoder
  Decode any JSON Web Token in your browser: view the header, payload, standard claims, expiry status, and raw base64url parts. Nothing sent to a server.
• JWT Generator / Signer - HS256 Client-Side JWT Creator
  Generate and sign JSON Web Tokens (JWT) using HMAC-SHA256 (HS256) entirely in the browser. Edit the payload, set a secret key, and inspect the decoded header, payload, and signature.
• Markdown Table Generator - Build Tables Visually
  Create Markdown tables by filling in a visual grid. Set column alignment, add rows and columns, copy the result.
• Markdown TOC Generator
  Paste Markdown and generate a table of contents with anchor links. Configure depth and style.
• MIME Type Lookup - Find MIME Types by Extension or Name
  Look up MIME types by file extension, or find extensions for a MIME type. Covers 100+ types across images, audio, video, documents, fonts, and more, fully offline.
• Number Base Converter - Binary, Octal, Decimal, Hex
  Convert numbers between binary (base 2), octal (base 8), decimal (base 10), hexadecimal (base 16), and any base 2–36. Uses BigInt for large numbers.
• OAuth 2.0 PKCE Generator - Code Verifier & Challenge for S256
  Generate OAuth 2.0 PKCE code_verifier and code_challenge (S256) pairs for public clients. Build the complete authorization URL with client ID, redirect URI, scope, and state.
• On-Screen Pixel Ruler - Measure Anything on Your Screen
  A free on-screen pixel ruler that shows pixels, inches, centimetres, and millimetres. Enter your screen DPI for accurate physical measurements.
• PDF Text Extractor - Extract Text from PDF Files
  Extract all text content from a PDF file page by page. Copy the text to clipboard or download as a plain-text file. Works entirely in your browser - no server upload required.
• PPI Calculator - Pixels Per Inch & Dot Pitch
  Calculate pixels per inch (PPI), dot pitch, and total pixel count from your screen resolution and diagonal size. See whether your display is retina-class.
• Public/Private Keypair Generator - RSA & EC Keys Online
  Generate RSA or Elliptic Curve (ECDSA, ECDH) public/private keypairs in your browser using the Web Crypto API. Export as PEM or JWK. Keys never leave your device.
• PX to REM/EM Converter - CSS Unit Converter
  Convert between px, rem, em, %, and pt for any root and parent font size. Bulk-convert a list of pixel values to get a full CSS unit table instantly.
• Query String Parser
  Parse URL query strings into key-value tables and build query strings from your own values.
• Regex Cheat Sheet
  Browse and search a comprehensive regex cheat sheet. Test patterns against sample text instantly.
• Regex Tester
  Live regular expression tester with instant match highlighting, capture groups, replace and split modes, pattern explainer, cheat sheet, and worker-based timeout protection.
• Resistor Color Code Calculator - 4, 5 & 6 Band
  Decode resistor color bands to resistance and tolerance, or enter a value to find the matching band colors. Supports 4-band, 5-band, and 6-band resistors.
• robots.txt Generator - Build Your Crawler Rules File
  Generate a valid robots.txt file for your website. Control which bots can crawl which pages, add sitemap URLs, set crawl delays, and use presets for common configurations.
• Semver Comparator - Compare Semantic Version Numbers
  Compare two semantic version strings (1.2.3, v2.0.0-beta.1) to find which is greater, sort a list of versions, or calculate the next bump.
• SQL Formatter & Beautifier
  Format and beautify SQL online. Supports PostgreSQL, MySQL, T-SQL, SQLite, MariaDB, and PL/SQL. Choose keyword case and indentation, all in your browser.
• SQL JOIN Visualizer
  Visualize all 7 SQL JOIN types with Venn diagrams, descriptions, and ready-to-use SQL examples.
• String Byte-Size Counter - UTF-8, UTF-16, and UTF-32 Lengths
  Count how many bytes a string occupies in UTF-8, UTF-16 LE/BE, and UTF-32 encodings. See which characters are multi-byte and their individual byte sizes.
• String Escaper
  Escape and unescape strings for JSON, HTML, URL, regex, SQL, and Base64 encoding.
• SVG Optimizer - Minify and Clean SVG Files Online
  Optimize and minify SVG files by removing comments, metadata, whitespace, and empty attributes, all in your browser with instant size savings stats.
• SVG to PNG/JPG Rasterizer - Convert SVG to Image Online
  Convert SVG files to PNG or JPEG raster images in your browser. Choose scale factor and background color. No upload, instant download.
• Text Diff Viewer - Compare Two Texts Side by Side
  Compare two texts side by side or in unified format. Highlights added, removed, and modified lines with word- and character-level inline diff. Free, private, runs in your browser.
• TOML ↔ JSON Converter - Convert Online
  Convert TOML to JSON or JSON to TOML instantly in your browser. Supports tables, arrays of tables, inline tables, dotted keys, and all TOML scalar types.
• Type Scale Generator - CSS Typography Scale
  Generate a harmonious typographic scale for any base font size and modular ratio. Output CSS custom properties, Tailwind config values, or a plain table of font sizes.
• ULID Generator - Sortable Unique ID Generator
  Generate ULIDs (Universally Unique Lexicographically Sortable Identifiers) in the browser. ULIDs combine a millisecond-precision timestamp with cryptographic randomness into a 26-character Crockford Base32 string.
• Unicode Inspector
  Inspect every character in a string: code points, hex, HTML entities, CSS escapes, and categories.
• URL Parser & Inspector - Decode Any URL Instantly
  Parse any URL into its components: protocol, hostname, port, path, query parameters, and hash. Decode query strings, inspect domain parts, and build custom URLs.
• User Agent Parser
  Decode any User-Agent string into browser name, version, OS, device type, rendering engine, and CPU architecture, instantly in your browser.
• UUID Inspector - Parse and Explain UUID / GUID Strings
  Paste any UUID (v1 through v7, Nil, Max) to see its version, variant, embedded timestamp, node address, and a full field-by-field breakdown, fully offline.
• Wi-Fi QR Code Generator - Share Wi-Fi Credentials Instantly
  Generate a scannable QR code for your Wi-Fi network. Guests can scan it with any modern phone camera to connect instantly - no typing required. Supports WPA, WEP, and open networks.
• XML Formatter & Validator
  Format, beautify, or minify XML online. Validates well-formedness, highlights errors, and supports custom indentation, all in your browser.
• YAML Formatter & Validator
  Format and validate YAML online. Detect syntax errors, pretty-print with custom indent, and convert JSON to YAML, all in your browser.
• ZIP File Creator - Create ZIP Archives in Your Browser
  Create ZIP files directly in your browser. Add text files with custom names and content, then download the archive instantly. No uploads, no server.

Compress, convert, resize, and edit images locally.

• Badge Maker - Create Custom PNG Badges
  Design custom badges with text, emoji, shapes, and colors. Preview your badge live and download it as a PNG image directly from your browser.
• BlurHash Generator - Compact Image Placeholder
  Generate a BlurHash string from any image. BlurHash encodes a blurred image preview as a short ASCII string (typically 20-30 chars) for use as a placeholder while the real image loads.
• Dithering (1-bit) Image Converter - Floyd-Steinberg & Bayer
  Convert any image to 1-bit (black & white) using three classic dithering algorithms: simple threshold, Floyd-Steinberg error diffusion, or Bayer ordered dithering. Download as PNG.
• Duotone Image Generator - Two-Color Photo Effect
  Apply a duotone effect to any image: choose a shadow color and a highlight color and the tool maps the entire photo to a two-color palette. Download the result as PNG.
• EXIF Metadata Remover - Strip Photo Metadata for Privacy
  Remove EXIF metadata from photos before sharing them online. GPS location, camera model, date taken, and other embedded metadata are stripped by re-rendering the image through a browser canvas.
• EXIF Metadata Viewer - Read Image Camera Data Online
  View EXIF metadata from any JPEG image: camera make/model, GPS location, exposure settings, and more. Runs entirely in your browser. Images never leave your device.
• Favicon Generator
  Generate a complete favicon set from any image: 16×16, 32×32, 180×180 Apple touch icon, 192×192, and 512×512 PNG files plus a site.webmanifest. Download as ZIP. No uploads.
• Halftone Image Generator - Dot Pattern Photo Effect
  Convert any photo to a halftone dot pattern. Choose dot size, shape (circle or square), contrast, and colors. Download the result as PNG.
• Image Border / Frame Adder - Add Decorative Borders
  Add a solid colour, gradient, or drop-shadow frame to any image. Choose the border size and colour, preview the result instantly, and download as a PNG.
• Image Color Extractor - Extract Dominant Colors from Any Photo
  Extract the dominant color palette from any image. Upload a photo to instantly get 4–10 dominant colors with HEX, RGB, and HSL values. Runs entirely in your browser.
• Image Color Picker - Pick Colors from Any Image
  Click anywhere on an image to instantly get the pixel color in HEX, RGB, and HSL. Eyedropper tool runs entirely in your browser. Images never leave your device.
• Image Compressor
  Compress JPEG, PNG, and WebP images directly in your browser. Adjust quality, resize, convert formats, and download a ZIP of your batch. Images never leave your device.
• Image Cropper - Crop Images Free Online
  Crop any image online for free. Set custom dimensions, lock to 1:1, 4:3, 16:9, or other aspect ratios. Preview and download instantly. Images never leave your device.
• Image Format Converter
  Convert images between JPEG, PNG, WebP, AVIF, and BMP directly in your browser. Batch convert multiple files and download as a ZIP. Images never leave your device.
• Image Grid Splitter - Split Photo into Tiles
  Split any image into a grid of equal-sized tiles. Choose the number of columns and rows, preview the grid, and download all tiles as individual PNG files or as a single ZIP archive.
• Image Histogram Viewer - Analyze RGB & Luminance Distribution
  Upload any image to instantly view its RGB and luminance histogram. Analyze tonal distribution, exposure, and color balance, all in-browser.
• Image Region Redactor - Blur or Pixelate Sensitive Areas
  Draw rectangles over sensitive areas in a photo and apply blur, pixelation, or black-fill redaction. Works entirely in your browser - no uploads required.
• Image Resizer
  Resize images to any dimension directly in your browser. Choose fit, fill, or stretch mode, adjust quality, and download instantly. Images never leave your device.
• Image Rotator & Flipper - Rotate and Mirror Images Online
  Rotate images 90°, 180°, or 270° and flip them horizontally or vertically, all in your browser with no upload required.
• Image to Base64 Converter
  Convert any image to a base64 data URL instantly in your browser. Get HTML img tag and CSS background-image snippets ready to paste. Your image never leaves your device.
• Image Watermark Tool - Add Text Watermarks to Photos
  Add a custom text watermark to any image directly in your browser. Choose position, opacity, font size, and color. No upload, 100% private.
• Meme Generator
  Add top and bottom text to any image and download your meme. Customize font size, stroke, text color, and stroke color. All in-browser, so your images never leave your device.
• Noise Texture Generator - Perlin / Value Noise PNG
  Generate procedural noise textures in your browser. Adjust scale, octaves, persistence, seed, and color scheme. Download as a PNG image.
• Online Whiteboard - Free Drawing & Sketching Pad
  A free online drawing and whiteboard pad. Sketch, annotate, and draw shapes in your browser with pen, eraser, line, rectangle, circle, and fill tools. Download your drawing as a PNG. No sign-up required.
• Open Graph / Social Card Image Generator
  Generate a 1200x630 Open Graph social card image with custom title, subtitle, background and text colours. Preview live and download as a PNG to use with og:image meta tags.
• Particle Playground - Canvas Animation Tool
  An interactive particle animation playground running in your browser. Adjust count, speed, size, color modes, and trail settings in real time.
• Photomosaic Generator - Pixel Art Mosaic Effect
  Upload a photo and transform it into a color-block mosaic with square or circular tiles. Adjust grid size and gap, then download the result as a PNG.
• Pixel Art Editor
  Draw pixel art in the browser with a palette, flood fill, and PNG export.
• Posterize / Color-Reduce Image Tool - Online Posterizer
  Reduce the number of colors in an image to create a bold posterized look. Choose between 2 and 8 color levels per channel, preview the result instantly, and download as PNG.
• QR Code Customizer - Custom Color QR Generator
  Generate QR codes with custom foreground and background colors. Adjust size, error correction level, and margin. Download as a PNG image.
• Signature Pad - Draw & Download Signature
  Draw your signature with a mouse or touchscreen. Download as a transparent PNG or SVG. Adjust stroke color and width.
• SVG Path Editor / Previewer - Live Path Visualizer
  Paste an SVG path `d` attribute and instantly see a live SVG preview. Translate and scale the path, inspect parsed commands, and copy the modified path.
• SVG Sprite Generator - Combine SVG Icons
  Upload multiple SVG files and combine them into a single SVG sprite sheet with <symbol> elements. Download the sprite sheet and get <use> snippets for each icon.

Merge, split, and convert PDFs in your browser.

• Image to PDF Converter
  Combine multiple images into a single PDF in your browser. Choose page size, orientation, and margin. Your files never leave your device.
• PDF Merger
  Merge multiple PDF files into one entirely in your browser. Reorder pages, rotate, delete, and download. Your files never leave your device.
• PDF Metadata Editor - Edit PDF Title, Author & Properties Online
  View and edit the title, author, subject, keywords, and other metadata fields of any PDF file directly in your browser.
• PDF OCR - Extract Text from Scanned PDFs
  Extract text from scanned, image-based PDFs using OCR entirely in your browser. Outputs plain text, Markdown, searchable PDF, or developer hOCR/JSON. No uploads.
• PDF Page Extractor
  Extract specific pages from a PDF into a new, smaller file. Runs entirely in your browser. No uploads, no accounts.
• PDF Page Numbering - Add Page Numbers to Any PDF
  Add page numbers to any PDF. Choose position, style, font size, and starting page number. Runs entirely in your browser.
• PDF Page Reorder
  Rearrange the pages of a PDF into any order, entirely in your browser. No uploads, no accounts.
• PDF Page Rotator - Rotate PDF Pages Online Free
  Rotate individual pages or all pages of a PDF by 90, 180, or 270 degrees entirely in your browser. Files never leave your device.
• PDF Splitter
  Split a PDF into multiple files by page range, every N pages, or one PDF per page. Runs entirely in your browser. No uploads, no accounts.
• PDF to Image Converter
  Convert PDF pages to PNG or JPEG images in your browser. Choose DPI, select pages, and download as a ZIP. No uploads, no accounts.
• PDF Watermark Tool - Add Text Watermarks to PDF Online
  Add custom text watermarks to every page of a PDF with control over font size, opacity, and position. Runs entirely in your browser.

UUIDs, dice, coin flips, lottery picks, and other randomness.

• Bingo Card Generator - Free Printable BINGO Cards Online
  Generate random 5×5 BINGO cards instantly. Mark numbers as they are called, with automatic win detection for rows, columns, and diagonals.
• Coin Flipper - Flip a Virtual Coin Online
  Flip one coin or up to 10 at once. Tracks session stats (heads/tails %) and full history. Optional weighted coin for probability experiments. All randomness uses Web Crypto.
• Decision Wheel & Random Picker - Spin to Decide
  Enter your options and spin the wheel to get a random pick. Great for making decisions, choosing winners, or settling debates. Runs entirely in your browser.
• Dice Roller - Roll Any Dice Online (D&D Notation)
  Roll d4, d6, d8, d10, d12, d20, d100 or any custom die. Full D&D dice notation: 4d6kh3, 2d20kl1, 3d8! and more. Per-die results, totals, history. All randomness via Web Crypto.
• Lottery Number Picker - Powerball, Mega Millions & More
  Generate random lottery numbers for Powerball, Mega Millions, EuroMillions, or a custom game. All picks use your browser's crypto API.
• Magic 8-Ball - Ask the Online Magic 8 Ball
  Ask the classic Magic 8-Ball any yes/no question and receive one of 20 authentic responses. All decisions are final.
• Mock Data / Fake Data Generator
  Generate realistic fake data instantly: names, emails, phones, addresses, UUIDs, and more. Export as JSON, CSV, or SQL INSERT statements. 100% client-side, no data sent anywhere.
• Random Color Generator - HEX, RGB & HSL Colors Online
  Generate random colors instantly in HEX, RGB, and HSL formats. Create single colors or full palettes of up to 20 colors with one click.
• Random Name Picker - Pick Winners & Raffle Names Online
  Pick one or more random names from a list. Supports raffle mode (remove after pick), unique picks, or draws with replacement. Runs entirely in your browser.
• Random Number Generator
  Generate random integers or decimals within any range. Set count up to 10,000, allow or exclude duplicates, and sort the output. All randomness uses the Web Crypto API.
• Random Quote Generator - Inspiring & Famous Quotes Online
  Get a random inspirational, philosophical, or funny quote with one click. Filter by category and copy quotes to share anywhere.
• Random Team Generator - Split a List Into Teams Instantly
  Paste a list of names and split them into random teams. Choose the number of teams or set a maximum team size. All randomness is cryptographically secure and runs in your browser.
• Random Trivia Generator - Quiz Questions Online
  Test your knowledge with random trivia questions across Science, History, Geography, Pop Culture, Sports, and Nature. Track your score and challenge yourself.
• Secret Santa Generator - Random Gift Assignment Picker
  Generate fair Secret Santa gift assignments. Add participants, set exclusions, and reveal each assignment one at a time.
• UUID / GUID Generator
  Generate cryptographically random UUIDs: v4, v1, v7, or NIL. Format as standard, no hyphens, uppercase, braces, or URN. Copy one or all.

Format and checksum validators for credit cards, IBANs, and ISBNs.

• Credit Card Validator - Luhn Check & Card Type Detector
  Validate credit card numbers using the Luhn algorithm. Detects Visa, Mastercard, Amex, Discover, and more. Runs entirely in your browser.
• IBAN Validator - Check Any International Bank Account Number
  Validate any IBAN instantly. Checks country code, length, and mod-97 checksum for 75+ countries. Runs entirely in your browser.
• ISBN Validator - Check ISBN-10 and ISBN-13 Numbers
  Validate ISBN-10 and ISBN-13 book numbers. Checks the checksum and converts between formats.
• MAC Address Validator - Validate & Decode MAC Addresses
  Validate any MAC address format (colon, hyphen, Cisco dot, raw hex). Identifies multicast, broadcast, and locally-administered addresses. Shows the OUI prefix.
• UUID Validator - Validate & Decode UUID Online
  Validate any UUID string instantly. Detects version (v1–v8), variant, and decodes the timestamp for v1 UUIDs. 100% client-side.
• VIN Decoder - Decode Vehicle Identification Numbers Online
  Decode any 17-character VIN instantly. Shows manufacturer region, model year, plant code, and validates the NHTSA check digit. 100% client-side.

Base64, URL, and HTML entity encoders and decoders.

• Base32 Encoder/Decoder - RFC 4648, Crockford & Base32hex
  Encode and decode text or binary data using Base32 (RFC 4648 standard, Base32hex, or Crockford variant). Copy output with one click. Runs entirely in your browser.
• Base64 Encoder / Decoder
  Encode text or files to Base64 online: standard, URL-safe, and Base64url variants. Decode back to text or download as a file. All processing is local.
• Binary Text Encoder/Decoder - Text to Binary & Back
  Convert any UTF-8 text to binary (8-bit groups) or decode binary back to text. Choose your separator format. Free, instant, browser-only.
• HTML Entity Encoder / Decoder
  Encode special characters to HTML entities and decode them back. Supports named (&amp;amp;), decimal (&#38;), and hex (&#x26;) styles. Runs entirely in your browser.
• Punycode (IDN) Encoder/Decoder - Convert Unicode Domains
  Encode Unicode / internationalized domain names (IDN) to Punycode (xn--) and decode them back. Implements RFC 3492 entirely in the browser.
• QR Code Generator
  Generate QR codes for URLs, text, Wi-Fi, vCards, email, SMS, phone, geo, crypto, and calendar events. Customize colors, size, and error correction. Download as PNG or SVG.
• Quoted-Printable Encoder/Decoder - RFC 2045 QP Online
  Encode text to Quoted-Printable (QP) or decode QP back to plain text. Implements RFC 2045 Section 6.7 with proper 76-char line wrapping.
• URL Encoder / Decoder
  Encode and decode URLs online: encodeURIComponent for query values, encodeURI for full URLs, or percent-decode any encoded string. All processing is local.
• URL-Safe Base64 Encoder - Base64url Encode & Decode
  Encode and decode text using URL-safe Base64 (Base64url, RFC 4648 §5). Handles + to -, / to _, optional padding. Also decodes JWT headers and payloads, fully offline.
• UUencode / UUdecode - Encode & Decode UU Online
  Encode text or data to UU format and decode UU-encoded content back to plain text. Classic Unix uuencoding implemented entirely in your browser.

Specialty calculators and small utilities.

• Carpet & Flooring Calculator - Square Yards & Cost
  Calculate carpet, hardwood, tile, or laminate flooring needed for a room with configurable waste percentage and price estimate.
• Chore Chart & Household Task Manager
  Create a household chore chart, assign tasks to family members or housemates, and mark chores as done. All data is saved in your browser - no account needed.
• Concrete Calculator - Slabs, Footings, Columns & Steps
  Calculate how much concrete you need for slabs, footings, round columns, or steps. Get cubic yards (or m³) and bag count for 40, 60, and 80 lb bags.
• Drywall Calculator - Sheets & Finishing Materials
  Calculate drywall sheets, joint tape, and screws needed for walls and ceilings by room dimensions. Adds a 10% waste factor.
• Eisenhower Priority Matrix
  Organize tasks into a four-quadrant Eisenhower Matrix: Do, Schedule, Delegate, Eliminate. Prioritize your work and eliminate distractions.
• Fence Calculator - Posts, Panels & Materials
  Calculate number of fence posts, panels, and pickets needed for a given perimeter and panel spacing.
• Firewood (Cord) Calculator - Cords & BTU Heat Output
  Calculate cords of firewood by stack dimensions or estimate heating season needs. Compare BTU output across common wood species.
• Flashcard Creator - Make, Study & Export Flashcard Decks
  Create flashcard decks, study with spaced-repetition (Leitner system), and import/export as JSON or CSV. Everything stored in your browser. No account needed.
• Fuel Cost Calculator
  Calculate the total fuel cost for any trip. Enter distance, MPG or L/100km, and price per gallon or liter. Split costs between passengers.
• Gas Mileage (MPG) Calculator
  Calculate your vehicle's gas mileage in MPG, km/L, and L/100km from distance traveled and fuel used.
• Grass Seed Calculator - Overseeding & New Lawn
  Calculate grass seed quantity for new lawns or overseeding by area and grass type seeding rate.
• Gravel & Aggregate Calculator - Tons & Cubic Yards
  Calculate gravel, crushed stone, sand, or mulch quantity needed for a project by area and depth. Results in cubic yards, cubic metres, and estimated tons.
• Kanban Board (Todo / In Progress / Done)
  A lightweight Kanban board with Todo, In Progress, and Done columns. Add cards, move them between columns, and organize your personal tasks - saved to localStorage.
• Lumber Calculator - Board-Foot Calculator Online
  Calculate board-feet, total cost, and estimated weight for any lumber order. Supports multiple pieces and wood species density for weight estimation.
• Meeting Cost Calculator - Live Running Cost Clock
  Track the real-time cost of your meetings. Enter attendee count and average salary, then start the clock to see how much the meeting costs per second, minute, and in total.
• Mind Map / Thought Web Organizer
  Create and organize mind maps in your browser. Add nodes, drag to rearrange, double-click to edit text, and save your map automatically with localStorage.
• Mulch & Soil Calculator - How Much Mulch Do I Need?
  Calculate how much mulch or soil you need for garden beds. Enter bed dimensions and desired depth to get cubic feet, cubic yards, and bags to buy.
• Notes - Online Notepad with localStorage
  A free online notepad that saves your notes automatically in your browser. Create, edit, delete, and search notes. No account or internet connection required. All notes persist in localStorage.
• Packing List Generator
  Generate a customized packing list for any trip type - beach, hiking, business travel, camping, city break, or ski trip. Check off items as you pack and save your list.
• Paint Calculator - How Many Gallons Do I Need?
  Calculate how much paint you need for a room. Enter dimensions or wall area, subtract windows and doors, set coverage and coats, and get gallons rounded up.
• Ramp Slope (ADA) Calculator - Angle & Run Length
  Calculate ramp length, angle, and slope ratio from rise and run. Checks ADA compliance (1:12 max slope) and shows results in degrees and percent grade.
• Ranked-Choice / Instant-Runoff Vote Calculator
  Run an instant-runoff (ranked-choice) election. Add candidates, enter ranked ballots, and see which candidate wins through progressive elimination rounds.
• Roof Pitch Calculator - Rise/Run, Degrees & Rafter Length
  Convert any roof pitch between rise/run ratio, degrees, and percent slope. Calculate rafter length and roof surface area instantly.
• Stair Stringer Calculator - Rise, Run & Stringer Length
  Calculate stair rise, run, number of steps, and stringer length from total rise and code-compliant constraints.
• Tally Counter
  Multi-category tally counter with configurable step size. Count anything - inventory, surveys, events.
• Tier List Maker
  Create a tier list by dragging items into S, A, B, C, D, and F tiers. Add your own items, rearrange them, and share the results. Saved to localStorage.
• Tile Calculator - How Many Tiles Do I Need?
  Calculate how many tiles you need for a floor or wall. Enter room dimensions, tile size, grout gap, and waste percentage. Instantly shows tiles needed and boxes to buy.
• Time Blocking Day Planner - Daily Schedule Builder
  Plan your day with time blocks. Add, edit, and remove schedule blocks on a visual 24-hour timeline. Your schedule is saved locally in your browser.
• Tournament Bracket Generator - Single Elimination
  Generate and fill a single-elimination tournament bracket. Enter up to 64 team or player names, then click to advance winners round by round.
• Typing Speed Test - Measure Your WPM and Accuracy
  Test your typing speed and accuracy with bundled passages at easy, medium, and hard difficulty. See gross WPM, net WPM, accuracy, and your personal best history, all in-browser.
• vCard / Contact Card Generator
  Create and download a vCard 3.0 (.vcf) contact file. Share your contact details with anyone who can import it into any phone or email client.
• Wallpaper Calculator - How Many Rolls Do I Need?
  Calculate exactly how many wallpaper rolls you need for any room. Enter room dimensions, door and window counts, roll size, and pattern repeat.
• Weighted Decision Matrix
  Make better decisions by scoring options against weighted criteria. Add your own options and criteria, assign weights, rate each option, and get an objective ranked result.

Free, browser-based SEO and marketing utilities - preview search snippets and social cards, generate meta and schema markup, build UTM links, and audit on-page content. Nothing you paste is uploaded.

• Heading Structure Analyzer - Outline & SEO Checker
  Paste any HTML to extract and visualize the H1–H6 heading outline. Flags multiple H1s, skipped levels, and empty headings for SEO review.
• Keyword Density Analyzer - Check Word Frequency & TF
  Analyze any body of text for word frequency, keyword density %, and n-gram patterns. Toggle stop-word filtering, pin target keywords, and see a visual bar chart.
• Meta Tag Generator - OG & Twitter Card Builder
  Generate complete HTML <head> meta tags: title, description, canonical, Open Graph, and Twitter Card. Preview and copy the ready-to-paste code block. All processing is local.
• Open Graph Preview - Social Card Simulator
  Preview how your page looks when shared on Facebook, X (Twitter), LinkedIn, Discord, and Slack. Paste your page HTML or fill in the fields manually. No network requests.
• Schema Markup Generator - JSON-LD Structured Data
  Generate valid JSON-LD schema markup for FAQPage, HowTo, Article, Product, LocalBusiness, BreadcrumbList, and more. Form-driven, inline validation, pretty/minified toggle.
• SERP Preview - Google Snippet Simulator
  Preview how your page will look in Google search results. See real pixel-width title and description limits for desktop and mobile. Instantly check truncation.
• Title Tag Checker - Bulk Pixel-Width Validator
  Paste multiple page titles (one per line) to instantly see their pixel widths, pass/fail against Google thresholds, and optionally append a brand suffix.
• UTM Builder - Campaign URL Builder & QR Code
  Build UTM-tagged campaign URLs for Google Analytics. Round-trips existing UTM params, adds optional lowercase normalization, generates a QR code, and copies as plain URL or Markdown link.

Free, browser-based tools for creators and social marketers - caption length checks, thread splitting, hashtag generation, engagement and earnings math, and content planning. Your data never leaves your browser.

• Content Calendar Planner - Offline Social Media Scheduler
  Plan and schedule social media posts on a month/week/list grid. Color-coded by platform and status. Everything saved in your browser - no account, no sync, export/import as JSON.
• CPM / CPC / ROAS Calculator - Bidirectional Ad Math
  Solve for CPM, CPC, CTR, impressions, clicks, spend, conversions, CPA, or ROAS - enter any known values and the rest calculate automatically.
• Engagement Rate Calculator - ER by Followers & Reach
  Calculate engagement rate by followers, by reach, or by impressions. Per-post and account-average modes with benchmark context bands for each platform.
• Fake Tweet Generator - Mock Post Screenshot Maker
  Create mock social-post screenshots rendered on an HTML canvas. Customize display name, handle, text, likes, and retweets. Download as PNG. Watermark on by default.
• Hashtag Generator - Niche Hashtag Suggestions
  Generate relevant hashtag suggestions from a topic or keyword using a bundled offline dataset. CamelCase toggle, chip cloud UI, 30-tag limit for Instagram.
• Social Media Character Counter - All Platforms
  Count characters for 10+ social platforms simultaneously: X/Twitter, Instagram, LinkedIn, Facebook, TikTok, YouTube, Pinterest, and more. Uses Intl.Segmenter for accurate emoji counts.
• Social Media Image Size Guide - 2024 Dimensions
  Reference all current social media image dimensions for every major platform. Check a local image against the recommended spec and see a crop-preview overlay.
• Subscriber Milestone Countdown - Growth Projection
  Project when you will hit your next subscriber or follower milestone using linear or compounding growth models. Download a .ics calendar event for the projected date.
• Tweet / Thread Splitter - Long Text to Thread Posts
  Split long text into numbered thread posts that fit X/Twitter (280 chars) or any custom limit. Greedy sentence-packing, two-pass numbering, drag-to-reorder.
• YouTube Earnings Estimator - Revenue Projection
  Estimate YouTube ad revenue from view count and RPM. See daily, monthly, and yearly income projections with low/mid/high range bands. Estimate only - not connected to YouTube.

Chemistry, physics, and electronics calculators - molar mass, ideal gas law, projectile motion, half-life, LED resistors, voltage dividers, and more. All run in your browser.

• Battery Life Calculator - Runtime from Capacity & Current
  Estimate battery runtime from capacity (mAh) and current draw (mA). Add an efficiency factor (%) and optionally include self-discharge rate for accurate projections.
• BTU / AC Size Calculator - Room Cooling Load
  Calculate the BTU cooling capacity needed for a room based on dimensions, insulation, sun exposure, and occupancy.
• Capacitor Code Calculator - Decode & Encode Capacitor Codes
  Decode 3-digit ceramic capacitor codes (like 104 = 100 nF) to picofarads, nanofarads, and microfarads. Also convert a capacitance value back to its 3-digit code.
• Carbon Footprint Calculator - Estimate Your Annual CO₂ Emissions
  Estimate your personal annual CO₂e emissions from transport, home energy, diet, and shopping. See a breakdown by category and get personalised reduction tips.
• Decibel Calculator - dB Conversion for Voltage, Power & SPL
  Convert between decibels and voltage or power ratios. Calculate sound pressure level (dB SPL) from pressure in Pascals. Convert dB to amplitude ratios and back.
• Density Calculator - Mass, Volume & Density Solver
  Calculate density, mass, or volume using D = m/V. Supports metric and imperial units. Shows the triangle relationship and common material densities for reference.
• Doppler Effect Calculator - Observed Frequency & Pitch Shift
  Calculate the observed frequency of a moving sound source using the Doppler effect formula. Enter source frequency, velocities, and wave speed to compute the perceived frequency and pitch shift in semitones.
• Free Fall Calculator - Distance, Velocity & Time
  Calculate free-fall distance, velocity, or time using h=½gt² and v=gt. Supports metric (m/s²) and imperial (ft/s²). Ignores air resistance.
• Half-Life Calculator - Radioactive Decay & Remaining Amount
  Calculate remaining quantity, elapsed time, or half-life for radioactive decay using N(t)=N₀×(½)^(t/t½). Supports any initial quantity and time unit.
• Hooke's Law Calculator - F = kx Spring Force
  Solve Hooke's Law F = kx for force, spring constant, or extension. Also calculates elastic potential energy stored in the spring (U = 1/2kx^2).
• Ideal Gas Law Calculator - PV = nRT Solver
  Solve PV=nRT for any unknown variable. Supports atm, Pa, kPa, bar for pressure; L, mL for volume; K and °C for temperature. Shows step-by-step working.
• Interactive Periodic Table
  Browse all 118 elements with atomic number, symbol, mass, category, period, and group. Search by name, symbol, or number.
• Kinetic Energy Calculator - KE = 1/2mv^2 & PE = mgh
  Calculate kinetic energy (KE = 1/2mv^2) and gravitational potential energy (PE = mgh). Solve for any of mass, velocity, or height.
• LED Series Resistor Calculator - Ohm Value & Power
  Calculate the correct series resistor for your LED circuit. Enter supply voltage, forward voltage, and forward current; get resistance in ohms and nearest E12 value.
• Lens Calculator - Thin Lens Equation 1/f = 1/do + 1/di
  Solve the thin lens equation for focal length, object distance, or image distance. Computes magnification and tells you whether the image is real or virtual, upright or inverted.
• Logic Gate Simulator
  Simulate AND, OR, NOT, NAND, NOR, XOR, XNOR, and BUFFER logic gates interactively.
• Molar Mass Calculator - Molecular Weight from Formula
  Enter a chemical formula (e.g. H₂O, NaCl, C₆H₁₂O₆) and instantly calculate molar mass with a per-element breakdown. Supports parentheses and nested groups.
• Molarity Calculator - Solution Concentration & Dilution
  Calculate solution molarity (moles per liter), dilute solutions using C₁V₁=C₂V₂, and convert between grams, moles, and liters. All offline.
• NE555 Timer Calculator - Astable & Monostable Modes
  Calculate NE555 timer frequency, period, duty cycle, and pulse width for both astable (oscillator) and monostable (one-shot) configurations. Enter R1, R2, and capacitor values.
• Op-Amp Calculator - Inverting, Non-Inverting & Difference Gain
  Calculate op-amp gain for inverting, non-inverting, and difference amplifier configurations. Enter Rf and Rin to get the gain, or supply input voltage to compute the output.
• Pendulum Calculator - Period, Frequency & Length
  Calculate the period (T = 2pisqrt(L/g)), frequency, and length of a simple pendulum. Enter any two values to solve for the third. Supports custom gravitational acceleration.
• pH Calculator - Acidity, [H], and pOH Converter
  Convert between pH, hydrogen ion concentration [H], and pOH. Determine whether a solution is acidic, neutral, or basic.
• Physics Constants Reference
  Look up 20+ fundamental physics constants including speed of light, Planck constant, gravitational constant, and more.
• Pool Volume & Chlorine Calculator
  Calculate swimming pool volume in gallons or litres and the chlorine dose needed to reach a target ppm for rectangular, oval, or round pools.
• Projectile Motion Calculator - Range, Height & Time
  Calculate projectile range, maximum height, time of flight, and velocity components from initial speed and launch angle. Supports m/s and ft/s.
• Reynolds Number Calculator - Laminar vs Turbulent Flow
  Calculate the Reynolds number (Re = vL/) for any fluid and pipe geometry. Instantly determine whether flow is laminar, transitional, or turbulent.
• Snell's Law Calculator - Refraction Angle & Total Internal Reflection
  Solve Snell's Law nsin(theta) = nsin(theta) for the refracted angle or refractive index. Automatically detects total internal reflection and shows the critical angle.
• Specific Heat Calculator - Q = mcT Solver
  Solve the specific heat equation Q = m x c x T for any of the four variables: heat energy (Q), mass (m), specific heat capacity (c), or temperature change (T). Includes a table of common materials.
• Voltage Divider Calculator - R1, R2, V_out Solver
  Solve the voltage divider formula V_out = V_in × R2/(R1+R2) for any unknown. Shows current draw and supports standard E12/E24 resistor series lookup.
• Wavelength ↔ Frequency Calculator - EM & Sound Waves
  Convert between wavelength and frequency for light, radio waves, and sound. Uses c=λf for EM waves and v=λf for sound with a customizable wave speed.
• Wire Gauge (AWG) Calculator - Diameter, Ampacity & Resistance
  Look up AWG wire gauge properties: diameter (mm/in), cross-section area, resistance per 100 ft/m, and maximum current capacity for chassis and in-wall wiring.

BPM counters, note frequency calculators, chord finders, subwoofer box calculators, audio file size estimators, and an in-browser instrument tuner.

• Audio File Size Calculator - Uncompressed & Compressed
  Estimate audio file size for WAV/AIFF (uncompressed) and MP3/AAC/OGG (compressed). Enter sample rate, bit depth, channels, and duration to get file size in MB.
• Chord Finder - Notes in Any Musical Chord
  Find the notes in any musical chord: major, minor, diminished, augmented, 7th, 9th, and more. Select root note and chord quality to see intervals and all enharmonic spellings.
• Note Frequency Calculator - Musical Note to Hz Converter
  Convert between note names (C4, A4, Bb3), MIDI note numbers, and frequencies in Hz. Supports A440 and A432 tuning. Shows octave, cents deviation, and wavelength.
• Online Instrument Tuner - Browser Mic Pitch Detection
  Tune any instrument using your browser microphone. Detects pitch via autocorrelation, displays the nearest note name and cents deviation. Nothing is uploaded.
• Online Metronome - Free BPM Metronome with Click Track
  Free online metronome with adjustable BPM, time signatures, and subdivisions. Start/stop with a click. Runs in your browser using Web Audio API, no install required.
• Online Tone Generator - Sine Wave & Audio Frequency Generator
  Generate pure tones at any frequency from 20 Hz to 20,000 Hz. Choose sine, square, sawtooth, or triangle waveforms. Set frequency by note or enter Hz directly. Runs in your browser.
• Subwoofer Box Calculator - Port Length & Box Volume
  Calculate ported subwoofer box port length from enclosure volume, tuning frequency, and port diameter. Also checks box volume and port velocity recommendations.
• Tap Tempo - Online BPM Counter & Metronome
  Tap the button or press Space to measure BPM in real time. Displays rolling average, rejects outliers, and shows milliseconds per beat and musical note values.

Word game helpers, dice rollers, score cards, and puzzle tools - all running locally in your browser with no server required.

• 2048 Game
  Slide numbered tiles on a 4×4 grid to combine them and reach the 2048 tile in this addictive puzzle game.
• Aim Trainer - Click Accuracy & Speed Test
  Improve your mouse accuracy and click speed. Targets appear at random positions - click them as fast as possible. Track your accuracy and average reaction time.
• Blind Spot Test - Find Your Visual Blind Spot Online
  Find your eye's natural blind spot (optic disc) using a monocular fixation test. Cover one eye, fixate on the cross, and discover where the dot vanishes from your field of view.
• Block Stacker - Free Online Tetris-Style Game
  Stack falling tetrominoes to clear lines in this Tetris-style puzzle game.
• Brick Breaker - Free Online Breakout Game
  Break all the bricks with a bouncing ball and paddle.
• Checkers Game - Play Draughts Online Free
  Play checkers (draughts) against an AI opponent in your browser.
• Chess Game - Play Chess Online Free
  Play chess against a simple AI opponent in your browser.
• Connect Four
  Drop colored discs to connect four in a row - horizontally, vertically, or diagonally. Play vs AI or a friend.
• Crossword Pattern Solver - Fill in the Blanks
  Enter a crossword pattern with known letters and question marks for blanks (e.g. "C?T"). Find all matching words from the built-in dictionary.
• Cryptogram Puzzle Generator
  Generate substitution cipher cryptogram puzzles from quotes or your own text. Solve interactively in the browser.
• D&D Dice & Initiative Roller - All RPG Dice
  Roll d4, d6, d8, d10, d12, d20, and d100 individually or in combinations. Track initiative order for up to 8 creatures. History log included.
• Ear Training Game - Learn Musical Intervals
  Train your musical ear by identifying intervals between two played notes.
• Hangman Game
  Guess the hidden word letter by letter before the hangman is drawn. Multiple word categories available.
• Lights Out - Classic Logic Puzzle Game
  Toggle lights on a 5x5 grid to turn them all off. A classic logic puzzle.
• Mad Libs Generator - Fill-in-the-Blank Story Builder
  Choose a story template, fill in nouns, verbs, adjectives, and names, then reveal the hilarious result. Multiple story templates included.
• Maze Generator
  Generate random mazes of any size using recursive backtracking and navigate through them with arrow keys or touch.
• Memory Match Card Game
  Classic concentration card-matching game. Flip cards to find matching pairs as fast as possible.
• Mental Math Speed Quiz - Arithmetic Under Time Pressure
  Sharpen your mental arithmetic with timed addition, subtraction, multiplication, and division questions. Choose difficulty and track your accuracy and speed.
• Minesweeper
  Play the classic minesweeper game. Choose beginner, intermediate, or expert difficulty.
• N-Back Working Memory Game - Dual N-Back Cognitive Trainer
  Train your working memory with the dual n-back task. Monitor a sequence of positions and letters and respond when a stimulus matches one from n steps back.
• Nonogram Puzzle - Free Picross Logic Game
  Solve nonogram (picross) puzzles by filling in cells using row and column clues.
• Number Memory Game - Digit Span Working Memory Test
  Test and train your digit span - the number of digits you can hold in working memory. Numbers are shown briefly; type them back as accurately as possible.
• Online Chess Clock - Count-Down Timer for Two Players
  Browser chess clock with configurable time controls (Bullet, Blitz, Rapid, Classical, custom). Tap to switch sides. Includes increment support.
• Pong Game - Free Online Classic Arcade Game
  Classic two-player Pong - play against the AI in the original arcade game.
• Reaction Time Test - Measure Your Reflexes Online
  Measure your reaction time with a 5-trial click test. Click as fast as possible when the screen turns green. See your average and percentile ranking.
• Rubik's Cube Timer
  Speedcubing timer with scramble generator, inspection time, and averages of 5 and 12 (Ao5 / Ao12) in WCA style.
• Scrabble & Words With Friends Score Calculator
  Calculate word scores for Scrabble or Words With Friends including double/triple letter and word bonuses. Supports blank tiles.
• Simon Says - Color Sequence Memory Game
  Play the classic Simon Says color memory game in your browser. Watch the growing color sequence and repeat it back. How far can you go?
• Sliding Puzzle (15-Puzzle)
  Play the classic 15-tile sliding puzzle. Shuffle and solve it by sliding tiles into the empty space.
• Snake Game - Free Classic Online Snake
  Classic snake game - eat apples, grow longer, avoid walls and yourself.
• Solitaire Game - Free Online Klondike Solitaire
  Play classic Klondike Solitaire card game in your browser.
• Stroop Effect Test - Cognitive Interference Experiment
  Experience the Stroop effect - identify the ink color of a color word as fast as possible. Measures cognitive interference when the word and color conflict.
• Sudoku Generator & Solver
  Generate a new Sudoku puzzle at easy, medium, or hard difficulty, then solve it in your browser with full validation.
• Sudoku Solver - Solve Any Sudoku Puzzle Instantly
  Instantly solve any 9×9 sudoku puzzle online. Enter your puzzle, click Solve, and get the complete solution in milliseconds. 100% client-side.
• Tic-Tac-Toe
  Play Tic-Tac-Toe against an unbeatable AI or with a friend in two-player mode.
• Whack-a-Mole - Free Online Reflex Game
  Click the moles as they pop up! A classic reflex-testing arcade game.
• Word Ladder - Transform Words One Letter at a Time
  Transform one word into another by changing one letter at a time, with each step being a valid word.
• Word Search Generator
  Create printable word search puzzles with your own word list. Words can be placed in 8 directions.
• Word Unscrambler - Find Words from Scrambled Letters
  Unscramble letters to find all valid English words. Filter by length. Useful for Scrabble, Wordle, and other word games.
• Wordle Solver & Helper - Filter Possible Words
  Enter your known letters, positions, and misses to filter the Wordle word list. Narrows thousands of 5-letter words to only valid candidates - no dictionary upload needed.
• Yahtzee Score Card - Digital Scoresheet
  Digital Yahtzee score card for up to 4 players. Auto-calculates upper section bonus, Yahtzee bonuses, and final totals.

Kitchen calculators for air fryer conversions, oven temperatures, baking percentages, coffee ratios, and more - fully client-side.

• Air Fryer Conversion Calculator - Temp & Time from Oven Recipe
  Convert conventional oven temperatures and cook times to air fryer settings. Reduces temperature by 25°F/15°C and time by ~20%.
• Baker's Percentage Calculator - Scale Any Bread Recipe
  Convert any bread recipe to baker's percentages or scale from a known flour weight. Supports multiple flours and add-ins.
• Caffeine Intake Calculator - Daily Limit & Half-Life
  Calculate total daily caffeine from coffee, tea, energy drinks, and soda. See time-to-half-life and estimated sleep impact.
• Coffee-to-Water Ratio Calculator - Brew Strength Guide
  Calculate coffee-to-water ratios for any brew method - drip, French press, pour-over, espresso. Enter cups or grams; get the exact recipe.
• Cooking Substitutions - Ingredient Substitute Lookup
  Find common cooking and baking ingredient substitutions instantly. Filter by vegan, gluten-free, dairy-free, or low-sodium. Works offline.
• Meat Roasting Time Calculator - Beef, Pork, Lamb & Chicken
  Calculate estimated roasting times for beef, pork, lamb, and chicken based on weight and desired doneness. Includes rest-time guidance.
• Oven Temperature Converter - °C, °F & Gas Mark
  Convert between Celsius, Fahrenheit, and gas mark oven temperatures with common description labels (Moderate, Hot, etc.).
• Pizza Dough Calculator - Baker's Percent Recipe Scaler
  Calculate pizza dough ingredients by number of balls, ball weight, and hydration percentage. Supports Neapolitan, NY-style, and custom ratios.
• Recipe Scaler - Scale Any Recipe Up or Down Online
  Scale any recipe up or down instantly. Paste your ingredient list, set original and target servings, and get perfectly scaled quantities with smart fraction display.
• Turkey Cooking & Thaw-Time Calculator
  Calculate roasting time and safe thawing time for a whole turkey based on weight and cooking method (stuffed vs. unstuffed, fridge vs. cold-water thaw).

Free, browser-based camera, microphone, and speaker tools - QR/barcode scanners, webcam and screen recorders, mic test, decibel meter, spectrum analyzer, and more. Everything runs on your device and is never uploaded.

• Audio Oscilloscope - Visualize Sound Waveforms Online
  Visualize sound waveforms from your microphone as an oscilloscope trace in real time. See the amplitude vs. time graph live in your browser.
• Audio Spectrum Analyzer - Frequency Visualizer Online
  Visualize the frequency spectrum of your microphone in real time using a live bar chart (FFT). Useful for audio analysis, room acoustics, and sound experiments.
• Barcode Scanner - Scan 1D/2D Barcodes with Camera
  Scan EAN-13, UPC-A, Code 128, Code 39, and other barcodes with your camera or from an uploaded image. All processing happens locally in your browser.
• Binaural Beats Generator - Focus, Relax & Sleep Tones
  Generate binaural beats for focus, relaxation, meditation, or sleep. Choose your carrier frequency and beat frequency. Use with headphones for best results.
• Camera Heart Rate Monitor - PPG Pulse Estimate
  Estimate your pulse by placing your fingertip over the camera lens. Uses photoplethysmography (PPG) color change analysis. For informational use only - not a medical device.
• Camera Light / EV Meter - Estimate Lux & Exposure from Webcam
  Estimate the lighting level in your scene using your webcam. Displays average luminance, approximate EV (exposure value), and a recommended exposure setting. Runs in your browser.
• Chord Progression Generator - Online Chord Progressions
  Generate diatonic chord progressions in any key and scale mode. Preview common progressions like I-IV-V or ii-V-I with chord symbols and playback.
• Color Picker from Camera - Eyedropper via Webcam
  Point your camera at any surface and click to pick the color. Get the HEX, RGB, and HSL values instantly. All processing is done locally in your browser.
• Decibel Meter - Sound Level Meter Online
  Measure the sound level around you with your microphone. See real-time dBFS readings, peak level, and average. All audio processing is local - nothing is recorded or uploaded.
• Document Scanner to PDF - Scan with Camera Online
  Use your camera to scan documents and save them as PDFs in the browser. Capture multiple pages and download the combined PDF. Nothing is uploaded.
• Drum Machine / Beat Sequencer - Online Browser Drums
  Create and play drum patterns in your browser with this 16-step beat sequencer. Kick, snare, hi-hat and more. Adjust BPM and apply presets.
• DTMF Tone Generator - Phone Keypad Tones Online
  Generate DTMF dual-tone multi-frequency signals for any phone keypad symbol (0-9, *, #, A-D). Click keys to dial and hear the tones in your browser.
• Face Landmark Detector - Real-Time Face Detection in Browser
  Detect faces in your webcam feed in real time using the browser's built-in Face Detection API. Draws bounding boxes locally - no images are uploaded.
• Green Screen / Chroma Key Tool - Webcam Background Remover
  Remove your webcam background using chroma key (green screen) technology. Choose a key color, adjust the threshold, and replace the background with any color or image - all in your browser.
• Guitar Chord Diagram Viewer - Common Guitar Chords
  Look up guitar chord fingerings with SVG fretboard diagrams. Covers major, minor, and 7th chords. No download needed.
• Image Steganography - Hide Text in an Image
  Hide a secret text message inside any PNG image using LSB steganography, or reveal hidden messages from an image. All processing runs locally in your browser.
• Interactive Circle of Fifths - Music Theory Reference
  Explore the circle of fifths interactively. Click any key to see its key signature, relative minor, and diatonic chords. Essential music theory reference.
• Isochronic Tones Generator - Single-Tone Pulsing Brain Entrainment
  Generate isochronic tones for focus, relaxation, or sleep. Unlike binaural beats, isochronic tones work without headphones. Choose a brainwave preset or customize the carrier and pulse frequencies.
• Live ASCII Art Camera - Webcam to ASCII in Real Time
  Turn your webcam feed into real-time ASCII art. Adjust the character density, invert colors, and copy or download the ASCII output. Runs entirely in your browser.
• Live BPM / Tempo Detector - Beat Detection from Microphone
  Detect the tempo (BPM) of music or rhythm in real time using your microphone. Uses onset energy detection to estimate beats per minute. No upload required - runs entirely in your browser.
• Microphone Test - Check Your Mic Online
  Test your microphone in the browser. See a live volume meter, waveform, and confirm audio input is working. No audio is recorded or uploaded.
• Music Scale Visualizer & Reference - Guitar Fretboard & Piano
  Visualize any music scale on a guitar fretboard and piano keyboard. Supports major, minor, pentatonic, blues, modes and more for all 12 roots.
• Online Hearing Test - Check Your Frequency Hearing Range
  Test your hearing range by playing tones from 20 Hz to 20 000 Hz. Find the highest and lowest frequencies you can hear. For informational use only - not a medical device.
• Photo Filters & Effects Studio - Vintage, Sketch, Cartoon & More
  Apply vintage, sepia, grayscale, sketch, cartoon, and other photo filters to any image in your browser. No upload required - all processing is done locally.
• Pixel Sorter / Glitch Art Generator - Pixel Sorting Online
  Create glitch art by sorting pixels in your image by brightness, hue, or color channel. Adjust threshold and direction for different visual effects. Runs entirely in your browser.
• Posture Reminder - Webcam Slouch Alert
  Use your webcam to monitor your posture and get reminders when you slouch. The tool takes a baseline photo of your upright posture and alerts you when frame differences indicate significant movement.
• Pupillary Distance (PD) Measurer - Camera Estimate
  Estimate your pupillary distance (PD) using your webcam and a credit card as a scale reference. Click on your pupils and card edges to measure. For informational use - not a prescription tool.
• QR Code Scanner - Scan with Camera or Upload Image
  Scan QR codes using your camera or decode from an uploaded image. Detects URLs, Wi-Fi, vCards, and more. 100% client-side, nothing uploaded.
• Screen Color Eyedropper - Pick Any Color from Your Screen
  Pick any color from anywhere on your screen using the browser EyeDropper API. Get instant HEX, RGB, and HSL values. No extensions required.
• Screen Recorder - Record Your Screen in the Browser
  Record your entire screen, a window, or a browser tab directly in the browser. Download as WebM. No installs, no uploads, everything stays on your device.
• Speaker Test - Check Left & Right Audio Channels
  Test your speakers or headphones by playing tones through the left, right, or both channels. Check stereo separation and frequency response.
• Speech to Text Dictation - Voice to Text Online
  Dictate text using your microphone. Uses the browser Web Speech API for real-time speech recognition. Copy or download your transcription. Nothing is sent to a server.
• Stop-Motion Animation Studio - Webcam Frame Capture
  Create stop-motion animations using your webcam. Capture frames one by one, preview the playback, and manage your frame sequence. Runs entirely in your browser.
• Teleprompter - Free Online Browser Teleprompter
  A free browser-based teleprompter. Paste your script, adjust speed, font size, and margins, then scroll hands-free. Pairs perfectly with your webcam for recording.
• Tilt-Shift / Miniature Effect Generator - Make Photos Look Like Models
  Create a tilt-shift miniature effect from any photo. Keep a horizontal band in focus and blur the rest to make real scenes look like tiny scale models. Runs locally in your browser.
• Time-Lapse Webcam Recorder - Interval Capture in Browser
  Record time-lapse footage directly in your browser using your webcam. Set the capture interval, watch the frame count grow, and download the captured frames.
• Tinnitus Notch / Masker Tone Tool - Sound Therapy Aid
  Generate a customized masking noise with a notch filter centred on your tinnitus frequency. For informational and relaxation use only - not a medical treatment. Consult an audiologist for clinical advice.
• Virtual Background & Portrait Blur - Webcam Background Blur
  Blur your webcam background in real time without any app installation. Adjust blur strength and portrait area. All processing happens locally in your browser.
• Virtual Piano Keyboard - Play Piano in the Browser
  Play a virtual piano keyboard directly in your browser using your mouse or QWERTY keyboard. No plugins or downloads required. Great for learning notes.
• Vocal Range Finder - Sing Your Note Range with Mic Pitch Detection
  Discover your singing vocal range using your microphone. Sing your lowest and highest notes - the tool detects the pitch and displays your note range and voice classification.
• Voice Changer - Pitch Shift Your Voice in the Browser
  Record your voice and play it back at a different pitch - chipmunk, deep monster, or anything in between. No upload needed, runs entirely in your browser.
• Voice Recorder - Record Audio and Download as WAV
  Record audio from your microphone in the browser and download the recording as a WAV file. No account, no upload, nothing stored on a server.
• Webcam Mirror - Use Your Camera as a Mirror Online
  Use your webcam as a live mirror in your browser. Flip horizontally, adjust zoom, and go full-screen. No video is recorded or uploaded.
• Webcam Motion Detector - Detect Movement Online
  Detect motion in real time using your webcam. Visualizes movement regions and triggers an alert. All video processing is local - nothing is recorded or uploaded.
• Webcam Photo Booth - Take Photos with Filters & Effects
  Take photos with your webcam and apply fun filters and effects: grayscale, sepia, invert, warm, cool, and more. Download your photos instantly. Nothing is uploaded.
• Webcam Test - Check Your Camera Online
  Test your webcam quickly and privately. See a live preview, check resolution, frame rate, and switch between connected cameras. Nothing is recorded or uploaded.
• Webcam Video Recorder - Record Video in Your Browser
  Record video from your webcam directly in the browser using MediaRecorder. Preview the recording and download as WebM. No uploads, no account needed.
• White, Pink & Brown Noise Generator - Sleep & Focus Sounds
  Generate white, pink, or brown noise for sleep, focus, or tinnitus relief. Adjust volume and choose noise color. Pure browser audio - no downloads needed.