What is AVIF?
AVIF is a newer image format based on the AV1 video codec. It is often half the size of a JPEG for the same quality, so websites increasingly serve it, and you may end up with .avif files when saving images. Current browsers open it, but many desktop apps, printers and upload forms do not yet.
Converting
The AVIF is decoded by your browser and re-encoded with MozJPEG. Quality 85 keeps the look; the JPEG will be larger than the AVIF. Transparent areas, if any, are filled with white.
HDR and wide colour
Some AVIF files hold HDR or wide-gamut colour. JPEG is standard dynamic range: highlights are mapped into the normal range and colours may look slightly less vivid. For most images the difference is not visible.
Browser support
Decoding needs a browser that supports AVIF, which all current Chrome, Edge, Firefox and Safari versions do. Very old browsers will show an error.
AVIF and JPG compared
| Feature | AVIF | JPG |
|---|---|---|
| Size for the same look | Smallest | Largest |
| HDR and wide colour | Yes | Standard range |
| Transparency | Yes | No |
| Opens everywhere | Modern browsers and apps | Everything |
Step by step
- Add your AVIF files: choose them, drag them onto the page, or paste.
- Set the quality; 85 is a good default.
- Click Convert to JPG.
- Download each file, or all of them as a ZIP. File names stay the same with the new extension.
Without this tool
Recent versions of Windows (with the AV1 extension) and macOS open AVIF in Photos or Preview, from which you can export JPEG. Older systems cannot open AVIF at all; this tool decodes it in the browser instead.
Troubleshooting
- A file shows an error. It may not really be AVIF: files are sometimes renamed without being converted. The tool reads the file's contents, not its name, and says what it found.
- The converted file is larger. That is expected when going to a less efficient or lossless format; it is not a fault.
- Colours shift slightly. Wide-gamut originals are converted to standard sRGB, which every screen shows consistently.
Should you keep AVIF?
For your own website, AVIF is an excellent format: much smaller pages for the same image quality. Keep AVIF versions for the web and convert to JPG only for places that need it, such as print shops, email to people on older devices, or upload forms. Batch conversion here lets you produce the JPG versions in one go.
Batches
Add up to ten AVIF files free (500 with the batch licence) and download them as JPGs in one ZIP, with their original names.
Private by design
The image never leaves your device. It is decoded in your browser, processed in a background worker by open-source codecs compiled to WebAssembly (MozJPEG, libwebp, libavif and OxiPNG, via the jsquash project, plus pica for resizing) and handed back as a download. There is no upload, no account and no server copy to delete. You can confirm it in your browser's developer tools: the Network tab shows the page's own files and the codec files loading, and nothing carrying your image. After the first visit the tools work offline.