Turn ICO icons and favicons into AVIF - the smallest web image format, transparency included. For the widest support pick ICO to PNG or WebP.
Going the other way? AVIF to ICO builds icons from AVIF images.
Firefox and Safari can write AVIF themselves, so nothing leaves your device.
Chrome and Edge cannot write AVIF yet. Then the decoded image goes to our server as a lossless PNG over HTTPS, is encoded to AVIF and deleted the moment you download it.
| ICO | AVIF | |
|---|---|---|
| Transparency | Yes | Yes, full alpha |
| Sizes per file | Several | One |
| File size | Large (raw bitmaps) | Tiny |
| Opens in | Windows, every browser as favicon | Modern browsers and apps |
| Best for | Icons and favicons | Images on fast web pages |
Want to check the result? The AVIF Analyzer shows its colour and size details.
Drop your ICO into the box, set the quality and press Convert to AVIF. The largest size inside the icon is used by default.
Yes. AVIF supports full transparency, so soft edges and transparent corners stay as in the icon.
Only when your browser cannot write AVIF (Chrome and Edge today). Then a lossless copy goes to our server over HTTPS and is deleted right after you download. In Firefox and Safari nothing is uploaded.
85 is a clean default for icons. Go to 92 with full colour for logos with fine text, or 50-60 for the smallest file.
Yes. Click the other thumbnails or press All - each size becomes its own AVIF.
No - browsers do not accept AVIF favicons. Keep a favicon.ico or PNG for that.