ICO to AVIF Converter
Convert ICO to AVIF free — no upload, no signup
To convert ICO to AVIF, drop your ICO images into the box below, click Convert, then Download. Fylo does the work inside your browser, so nothing is uploaded and there's no signup or watermark. It extracts an icon into the most compact modern format.
Drop images here
or tap to browse · paste with Ctrl+V · add many at once
Your files never leave your device
Higher keeps more detail; lower makes smaller files.
Advanced
Leave empty to keep the original size.
How to convert ICO to AVIF
Add your ICO files
Drag and drop ICO files into the box, tap to choose them, or paste with Ctrl+V. You can add many at once.
Check the quality
Leave AVIF quality at the default 60 or adjust the slider — higher keeps more detail, lower makes smaller files.
Convert and download
Click Convert, then download each AVIF or get them all in one ZIP.
Why convert ICO to AVIF?
If you're building a modern site and want icon images as small as possible, AVIF is the most efficient option current browsers support.
Does converting ICO to AVIF affect quality or size?
The largest image in the ICO is encoded as AVIF with transparency. For crisp edges on small icons, use quality 80 or higher; lossy AVIF compression can soften 1-pixel details.
What's the difference between ICO and AVIF?
ICO is the Windows icon format and the classic favicon.ico. One ICO file holds several square images (16 to 256 px) so each screen can use the sharpest size.
AVIF is a modern format based on the AV1 video codec. It often produces files about half the size of JPG with fewer artefacts, and supports transparency and HDR.
Learn more: ICO format guide · AVIF format guide
| Property | ICO | AVIF |
|---|---|---|
| Compression | PNG or uncompressed bitmap entries | Lossy or lossless (AV1) |
| Transparency | Yes | Yes — full alpha |
| Animation | No | Yes |
| Colour depth | Up to 32-bit + alpha | 8, 10 or 12-bit, HDR |
| Typical size, 12 MP photo | Max 256 × 256 px | ≈ 0.8–1.5 MB |
| Support | All browsers (favicons), Windows | Chrome 85+, Firefox 93+, Safari 16+, Edge 121+ |
| Best for | Favicons, Windows app and shortcut icons | Fast websites, hero images, photo galleries |
| Introduced | 1985 | 2019 |
Frequently asked questions
Is AVIF good for tiny icons?
For icons under 64 × 64 pixels the savings are small and lossy artefacts are more noticeable. PNG or lossless WebP is often the better choice there.
Does the AVIF keep transparency?
Yes, the icon's alpha channel is preserved.
Are my ICO files uploaded to a server?
No. Fylo converts ICO to AVIF entirely inside your browser using a background Web Worker, so your files never leave your device. That's also why it's fast — there's no upload or download wait.
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