Image Format Converter

How to use this tool

1. Drop or select images. Drag image files onto the drop zone or click to browse. You can add multiple files at once.
2. Choose the target format. Select JPEG, PNG, WebP, AVIF, or BMP. Adjust the quality for lossy formats and the background color for transparency-to-opaque conversions.
3. Convert. Click "Convert All" to process every image. Each card shows the original and output file sizes as it completes.
4. Download. Review each converted file size and output dimensions, then click the download button on any card or download the full batch as a ZIP.

HEIC / HEIF (Apple format)

HEIC (High Efficiency Image Container) is Apple's default photo format since iOS 11 / macOS High Sierra. It uses the HEVC codec and achieves roughly 50% better compression than JPEG at equivalent quality. Despite this, many web services, older Windows applications, and Android devices don't natively support HEIC. Converting to JPEG or WebP is the most reliable way to share HEIC photos broadly. Note: browser-based HEIC conversion may not be supported in all browsers due to codec licensing.

Color profile preservation

Images can contain embedded ICC color profiles (e.g., sRGB, Display P3, Adobe RGB) that tell displays how to interpret the color values. When converting between formats, the HTML Canvas API works in the sRGB color space and does not preserve embedded ICC profiles. This is acceptable for most web images but can cause visible color shifts for wide-gamut photography (Display P3, Adobe RGB) or print workflows where color accuracy is critical. For print-critical work, use dedicated software like Photoshop or ImageMagick to preserve ICC profiles during conversion.

PNG vs JPEG: when to use each

Choosing the right image format is as important as choosing the right quality setting. The two most common formats: JPEG and PNG: serve different purposes:

• JPEG is a lossy format optimised for photographs and images with smooth color gradients. It achieves excellent compression because it discards subtle color detail that the eye can barely perceive. It does not support transparency.
• PNG is a lossless format that retains every pixel exactly. It is the best choice for screenshots, logos, UI icons, and images that contain text or sharp edges. PNG supports full transparency (alpha channel). The tradeoff is that PNG files are typically much larger than JPEG for photographs.

A common workflow: use PNG during design/editing (to avoid generational quality loss when re-saving), then export to JPEG or WebP for final web delivery.

What is WebP?

WebP is a modern image format developed by Google in 2010. It supports both lossy and lossless compression, as well as transparency and animation. This converter currently offers lossy WebP encoding through your browser's Canvas API; the quality control trades file size for image detail, and there is no lossless WebP mode here. WebP may produce smaller files than JPEG at similar visual quality, but results depend on the image and browser encoder.

• WebP supports both lossy and lossless modes as a format; this tool exposes lossy output only
• Full alpha transparency support and animated images in the format
• Supported in all major browsers since 2020 (Chrome, Firefox, Safari, Edge)

For web delivery, compare the converted WebP's size and appearance with the original before replacing it. If you need a lossless output, choose PNG here or use an encoder that explicitly provides lossless WebP.

Each result card reports signed size change using (output size − original size) ÷ original size × 100. A negative percentage means the converted file is smaller; a positive percentage means it is larger.

What is AVIF?

AVIF (AV1 Image File Format) is based on the AV1 video codec, developed by the Alliance for Open Media. It is the most space-efficient widely-supported image format available today:

• ~50% smaller than JPEG at the same visual quality
• Supports HDR, wide color gamut, and transparency
• Browser support: Chrome 85+, Firefox 113+, Safari 16+

AVIF encoding can be CPU-intensive, so encoding time is longer than JPEG or WebP. For most websites targeting modern browsers, WebP is a practical choice today; AVIF is the future. This tool detects whether your browser supports AVIF encoding and warns you if it does not.

Transparency and background color

PNG, WebP, and AVIF can store pixels with an alpha (transparency) channel. JPEG and BMP cannot. When you convert a transparent image to JPEG or BMP, the transparent areas must be filled with a solid color: this tool defaults to white but you can choose any color via the background color picker.

Tip: if your image has a transparent background and you are converting to JPEG for a web page with a specific background color, set the background color to match the page background so the image blends seamlessly.