Image Compressor

Our tool uses the browser's Canvas API to recompress images. Adjusting the quality slider changes the JPEG compression level, reducing file size while maintaining visual quality.

It depends on the format. PNG compression is lossless — every pixel is mathematically identical to the original, so quality never changes. Metadata like EXIF and color profiles are stripped for privacy, but the image data itself is untouched.

JPG and WebP use lossy compression, which does discard some visual data — but at sensible quality settings (70–85%) the difference is usually imperceptible while reducing file size by 50–80%.

Want to see for yourself? Use the Compare button after compression to open the side-by-side viewer. Switch to Diff mode to see pixel-level changes as a heatmap — neutral gray means no change, while colored areas reveal exactly where compression made a difference.

Keep format (default): Compresses without changing format — JPG stays JPG, WebP stays WebP, PNG is losslessly re-compressed to strip metadata and optimize encoding. Best when you just want a smaller file in the same format.

JPG: Converts everything to JPG. Maximum compatibility — works on every device, every browser, every app. The safe choice for sharing.

WebP: Converts to WebP — files are ~30% smaller than JPG at the same quality. Supported by 96%+ of browsers. Great for modern websites.

Read our complete format comparison guide for detailed benchmarks.

For most websites, WebP is the better choice — it produces files 25–35% smaller than JPG at the same visual quality, and 96%+ of browsers support it today (Chrome, Firefox, Safari 14+, Edge).

Use JPG if you need maximum compatibility — email attachments, legacy systems, government portals, or sites still supporting Internet Explorer. For the best of both worlds, serve WebP to modern browsers with a JPG fallback using the <picture> element.

See real benchmarks in our complete format comparison guide.

Input: JPG, PNG, and WebP (up to 10 files at once).

Output: JPG (maximum compatibility, works everywhere) or WebP (~30% smaller at the same quality, supported by all modern browsers). Use Keep format to stay in the original format — JPG stays JPG, WebP stays WebP, PNG stays PNG (lossless re-encode).

You can open and compress up to 10 images at once — all processed in parallel in your browser.

For web use, 70-85% provides the best balance of quality and file size — usually cutting files by 50-80% with no visible difference. For archival purposes, use 85-92%. Below 60%, compression artifacts become noticeable.

Here's the optimal workflow for website images:

1. Resize first. Never serve a 4000px photo in an 800px slot — use our Image Resizer to match your site's display width first. This alone can cut file size by 90%+.

2. Set quality to 70–85%. This range cuts file size by 50–80% with no visible difference. The quality slider's orange mark shows where your original sits — always drag below it for real savings.

3. Choose WebP as output. WebP images are ~30% smaller than JPG at the same quality. Use JPG only if you need legacy browser support.

4. Aim for under 200KB. Google Lighthouse flags images over 100KB as opportunities. Most content images at 1200px wide should land well under 200KB after following these steps.

📖 For a deeper dive — including benchmark data, side-by-side comparisons, and per-platform recommendations — read our full guide: Best Image Compression Settings for Web.

It shows your original image's estimated quality, found by matching its file size against the browser's encoder. If the slider is above the mark, the file may get larger instead of smaller — drag below the mark to ensure real compression.

The mark disappears for PNG files since they use lossless compression and have no quality level.

Yes! All compression happens locally in your browser using the Canvas API. Your images are never uploaded to any server.

Yes! Once you've visited the page, the compressor works without internet. All processing happens locally in your browser, so you can compress images anywhere — even on a plane.

Yes — it runs in any modern browser (Chrome, Firefox, Safari, Edge) on Windows, Mac, Linux, iPhone, iPad, and Android. All processing is local, so there's nothing to install.