Convert ICO to AVIF
ICO is the Windows icon format, used for favicons and application icons. Converting to AVIF is a size decision: AVIF reaches a comparable picture in a smaller file, which is why modern sites serve it. The conversion runs entirely in your browser: there is no upload, no file size limit and no watermark on the result.
Drop your ICO files below and download AVIF in seconds. Free, unlimited and completely private: the conversion runs inside your browser, so your files never leave your device and are never uploaded to a server.
No upload. Works with your network switched off. Check it yourself, or read what actually happens to your file.
Why convert ICO to AVIF?
ICO files bundle one or more icon sizes into a single file that Windows and browsers use for favicons and app icons. Regular image viewers often refuse to open them, and most editors cannot save them, so a converter is the practical way in or out of the format.
AVIF is based on the AV1 video codec and reaches even smaller files than WebP at the same visual quality. All modern browsers can display it, but many image editors and older tools cannot open it yet, which is the main reason people convert AVIF to an older format.
ICO vs AVIF at a glance
| ICO | AVIF | |
|---|---|---|
| Full name | Windows icon | AV1 Image File Format |
| Compression | Contains PNG or BMP data | Lossy or lossless |
| Transparency | Yes | Yes |
| Best for | Favicons and Windows application icons | Next generation web images |
What changes when you convert ICO to AVIF
| What happens | |
|---|---|
| Image quality | Depends on the quality setting above, which controls how much detail AVIF keeps. |
| Transparency | Kept. AVIF stores an alpha channel, so cut-out backgrounds and soft edges survive. |
| EXIF and GPS | Removed. The conversion goes through a pixel buffer, so camera data and location are not carried into the AVIF file. |
| Colour profile | Not carried across. The image is handled in sRGB, which is right for the web and wrong for colour-managed print work. |
| Animation | Not applicable. ICO files here are single images. |
| File size | Smaller in almost every case, which is the reason for the conversion. How much smaller depends on the picture, so no figure is quoted here. |
How to convert ICO to AVIF
- Drop one or more ICO files into the box above, or click to browse.
- ImageConvert converts each file to AVIF right on your device.
- Download a single file, or grab everything at once as a zip.
Frequently asked questions
What is an ICO file?
ICO is the Windows icon format, used for favicons and application icons.
What is an AVIF file?
AVIF is a next generation format with excellent compression, increasingly used on modern websites.
Is it free to convert ICO to AVIF?
Yes. There are no limits, no watermarks and no account needed. Convert as many ICO files as you like.
Are my files private?
Completely. Your ICO files never leave your browser and are never uploaded to a server, so your images stay on your device.