Image Compressor
Reduce image file size while maintaining quality
Drop images here
or click to browse · JPG, PNG, WebP · Up to 10 files
Lower quality = smaller file size. We recommend 70-85% for web use.
Keep format: Compress without changing format. JPG: Maximum compatibility — works everywhere. WebP: Smaller file size, supported by all modern browsers. Learn more about format differences →
Frequently Asked Questions
How does image compression work?
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.
Does compression reduce image quality?
Yes, lossy compression (JPEG, WebP) discards some visual data to make files smaller — 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.
Which output format should I choose?
Keep format (default): Compresses without changing format — WebP stays WebP, PNG stays PNG. 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.
What image formats are supported?
You can open JPG, PNG, and WebP images. For output, choose Keep format to preserve the original format, JPG for maximum compatibility, or WebP for the best balance of quality and file size.
How many images can I compress at once?
You can open and compress up to 10 images at once — all processed in parallel in your browser.
What quality setting should I use?
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.
Is compression really private?
Yes! All compression happens locally in your browser using the Canvas API. Your images are never uploaded to any server.
Does this work offline?
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.