CSS Beautifier & Minifier

How to use this tool

1. Paste CSS into the input panel, open a local .css or .txt file, or drop one on the panel.
2. Choose "Beautify" to format with indentation, or "Minify" to compress.
3. Select your preferred indentation size (2 spaces, 4 spaces, or tabs).
4. Review the output and the character counts in the status row.
5. Copy the result or download it as a .css file.

What is CSS beautifying?

CSS produced by preprocessors, minifiers, or copy-pasted from a browser DevTools panel is often dense and hard to read. Beautifying adds consistent indentation, line breaks after each declaration, and blank lines between rule blocks, making the code immediately understandable and reviewer-friendly.

What is CSS minification?

This basic minifier removes block comments, collapses whitespace, and tightens common structural characters to produce a smaller file for a quick one-off transformation. It does not merge selectors, shorten values, or perform the cascade-aware optimizations available in production build tools. Review the output before shipping; a project build pipeline is a better fit for production assets.

When to use each mode

Use Beautify during development and code review. Use Minify when you need a compact copy for a quick one-off task or to inspect how much whitespace can be removed. Build tools such as Vite, webpack, and esbuild typically handle production minification and other optimizations automatically.

CSS property order

Several popular conventions exist for ordering CSS properties within a rule. Consistent ordering improves readability and makes diffs easier to parse:

• Alphabetical: Sort all properties A–Z. Simple and deterministic, but conceptually unrelated properties can end up adjacent.
• Concentric CSS: Box model properties from outside-in: display, positioning, box model (margin -> border -> padding -> width/height), then typography, visual styles, transforms/animations.
• SMACSS order: Categorize by function: layout (position, display, float) -> box model -> typography -> visual -> misc. Popular in larger codebases.

This formatter preserves declaration order and does not sort properties. A minifier can remove whitespace while preserving the cascade order, so review duplicate declarations and overrides just as you would in the original stylesheet.

Vendor prefixes

This formatter does not add or remove vendor prefixes (-webkit-, -moz-, -ms-). Modern build pipelines use autoprefixer (a PostCSS plugin) to automatically inject prefixes based on your target browsers. Manual prefix management is no longer recommended.

Privacy

All processing runs entirely in your browser. Pasted CSS and files you open are read locally; the tool never uploads your stylesheet.