Convert ICO to AVIF — Smallest Web File
An ICO is a multi-resolution container for a square mark. AVIF compresses it harder than WEBP or PNG while still carrying an alpha channel, which makes it the smallest way to publish an icon as an ordinary image.
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Modern format with excellent compression. Limited browser support.
Apple's format. Excellent quality at small sizes.
Lossless format. Large files, ideal for print/archival.
256 colors max. Best for simple graphics.
Uncompressed bitmap. Very large files.
Vector trace. Best for logos and simple graphics. Not a pixel-perfect conversion.
Same format? You might want to compress instead.
SSIM-optimized — finds the lowest file size at your chosen visual fidelity.
Need to crop first? Use the Crop tool. Want to adjust or filter? Try the Editor.
Resize tool → Live preview, percentage scaling, and dimension presets.
Tip: Use PNG or WebP for transparent output. Standalone tool →
Lossless format — files can be large
GIF is limited to 256 colors
Best for logos, icons, and line art. Photos produce stylized results.
BMP files are uncompressed and can be very large. Consider TIFF (LZW) or PNG for lossless with smaller file sizes.
Leave empty for all pages. Multi-page PDFs produce a ZIP.
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ICO vs AVIF Comparison
| Feature | ICO | AVIF |
|---|---|---|
| Full Name | Icon File Format | AV1 Image File Format |
| Lossy Compression | ❌ | ✅ |
| Lossless Compression | ✅ | ✅ |
| Transparency | ✅ | ✅ |
| Animation | ❌ | ✅ |
| Browser Support | All browsers (favicon) | Chrome 85+, Firefox 93+, Safari 16.4+ |
| Color Depth | 16.7M (24/32-bit) | 16.7M+ (up to 12-bit HDR) |
| Typical Use | Website favicons, Windows application icons | Next-gen web images (even smaller than WEBP) |
| Year Introduced | 1985 | 2019 |
Why Convert ICO to AVIF?
AVIF is smaller again than WEBP and still carries alpha. For a logo used across a site it is the least bandwidth for the same appearance, provided every consumer is a modern browser.
How to Convert ICO to AVIF
Upload your .ico file.
The largest icon entry is extracted and re-encoded with AV1, keeping transparency.
Download the AVIF. Encoding takes a moment longer than PNG; the file is smaller.
Quality Note
AVIF handles the flat colour and hard edges of icon artwork well, but at these pixel dimensions the absolute saving is small. The reason to choose it is consistency with the rest of a site's images.