Start with the right format
- Photos: JPG or WebP. Both are lossy, which is fine — photos hide small losses well.
- Logos, screenshots, text, transparency: PNG or lossless WebP.
- Websites: WebP is usually 25–35% smaller than JPG at the same visual quality and works in every modern browser.
Converting a photo saved as PNG to JPG or WebP is often the single biggest saving — try PNG to WebP.
Resize first
A phone photo is often 4000 pixels wide, but a blog column shows it at 800. Resizing to the display size before compressing can cut file size by 90% with no visible change. Use resize image with “keep aspect ratio”.
The quality sweet spot
For JPG and WebP, quality between 75% and 85% is visually indistinguishable from the original for nearly all photos, yet roughly half the size. Drop to 60–70% only for thumbnails. Gradients (skies, studio backdrops) show banding first, so check those images at 100% zoom.
Don’t compress twice
Each lossy save throws away more detail. Keep an original master and export compressed copies from it rather than re-compressing an already compressed file.
Privacy
The image compressor on this site processes files inside your browser, so personal photos and documents are never uploaded anywhere.