ICO to AVIF converter
Convert ICO to AVIF in seconds, free and unlimited. No upload, no sign-up, no watermark: your image never leaves your device.
Last updated
Quick answer: To convert ICO to AVIF, add the ICO file to the iHateFiles ICO to AVIF converter and press Convert. The conversion runs in your browser, so the file is never uploaded, and it is free with no sign-up, watermark or size limit. Trades a little detail for a much smaller file. The quality slider decides how much.
Should you convert ICO to AVIF?
Do this for photographs, where AVIF saves a great deal of space for a difference almost nobody can see. Keep the ICO if the image is a screenshot, a logo, or anything with text or hard edges in it.
ICO keeps everything, AVIF does not
ICO stores the image exactly. AVIF discards detail to save space, and the quality setting on this page decides how much. This is the right trade for photographs and the wrong one for screenshots and line art, where ICO edges stay crisp and AVIF smudges them.
Expect a much smaller file
A ICO of a photograph is routinely several times the size of the same picture as AVIF. That saving is the reason to do this, and on a photograph it costs very little that anyone will notice.
ICO and AVIF side by side
| ICO | AVIF | |
|---|---|---|
| Compression | Lossless | Lossy |
| Transparency | Yes | Yes |
| Animation | No | No |
| Written here | Yes | Yes |
What usually goes wrong
About the ICO. Renaming a PNG to favicon.ico works in most browsers and then fails in the one that matters. A real ICO bundle avoids the argument entirely.
About the AVIF. Reading AVIF is nearly universal; writing it is not. A browser without an encoder quietly hands back a PNG instead of refusing, so the conversion looks as though it worked. Current Chrome on macOS is one of them. This site checks for a real encoder first and says so when there is none.
How to convert ICO to AVIF
- Add your ICO file. It is read from your disk and stays there.
- Check the settings. The output format is already set to AVIF.
- Press convert and the AVIF file is saved back to your device.
Questions
How do I convert ICO to AVIF?
Open this page, add your ICO file, and press convert. The file is decoded and re-encoded by your own browser and saved back to your device. Nothing is uploaded.
Is this ICO to AVIF converter free?
Yes, completely. There is no account, no sign-in, no watermark and no daily limit, because there is no server doing the work. Your own device does it.
Are my files uploaded anywhere?
No. There is no upload endpoint. The conversion runs inside this browser tab, so your file never leaves your device. You can open your browser's network panel and watch: nothing carrying your file is sent.
Is there a file size limit?
No fixed limit. Because the work happens on your machine there is no server quota. The only ceiling is your own device's memory, which for video means very large files may be slow.
Will converting to AVIF lose quality?
AVIF is a lossy format, so some detail is discarded. The quality control on this page decides how much. The default is set high enough that most people cannot see the difference.
Can I convert several ICO files at once?
Yes. Add as many as you like and they are converted one after another, then offered as a single ZIP.