Compress image makes images smaller while keeping the best quality for their size. The result is never larger than the original: if an image cannot be made smaller, you get it back unchanged.
- Lossy compression (JPG, WebP, AVIF, JPEG XL) gives the smallest files; at the recommended level the difference is hard to see.
- Lossless compression keeps every pixel exactly — choose Lossless only for screenshots, logos or images you will edit further.
- Target file size compresses until the image fits a limit, for example for a form or a marketplace that only accepts small files.
Which format for which use
| Format | Good for |
|---|---|
| WebP | Websites and shops — small, transparency supported, works in every current browser |
| AVIF | Websites where every kilobyte counts — often even smaller than WebP |
| JPEG XL | High-quality archiving and exchange where the receiving software supports it |
| JPG | Photos for e-mail, print shops and any software — the most compatible choice |
| PNG | Screenshots, logos and graphics with sharp edges or transparency |
Transparency is kept wherever the target format supports it; converting a transparent image to JPG fills the background. For the web, resize first: a photo straight from the camera is far larger than any page shows it. Optimise for web creates responsive AVIF, WebP and JPEG versions together with the matching HTML; it is part of the Pro and Business plans.