An image compressor that does not upload
The picture is read on your device. Nothing is uploaded, and there is no account or watermark.
The browser encodes the new file. There is no queue and no file-size cap from a server. A huge photo is opened at 4096 pixels on the long side so the tab stays responsive, and you are told when that happens.
JPG, WebP or AVIF
JPG is the file that opens everywhere. Quality around 80 is the usual compromise for photos. Lower if you only need a preview.
WebP is smaller than JPG at the same visual quality, and current browsers display it. AVIF is smaller again. This page only offers AVIF when your browser can actually write it, so you do not download a file you cannot open.
| Format | Best for | Transparency |
|---|---|---|
| JPG | Sharing, email, older tools | No |
| WebP | Websites and chat, smaller files | Yes |
| AVIF | Smallest files, where it is supported | Yes |
What compression changes
Lossy compression throws away detail on purpose. Text, screenshots and flat graphics suffer first. Photos tolerate it. If the picture is already a small JPG, compressing it again will not make it much smaller and can add artefacts.
PNG is not offered here because re-saving a photo as PNG usually makes it larger. Use the converter when you need PNG for an editor.