Turn ICO icons into AVIF. It is converted in your browser, so the file never leaves your device.
Drop ICO files here
or choose from your computer paste with Ctrl V
from Photos or Files
Ready · other file types work too0 bytes uploaded, ever
Drop ICO files onto the box above, or click it to choose them. ToAny reads the file's contents to detect the type, so a wrong extension does not matter.
Press Convert. Open Options first if you want to change the defaults. The work happens in this tab.
Save the AVIF, or download everything as one ZIP if you converted several files.
The ICO to AVIF converter is part of this page and runs inside your browser. Your icons are never sent to ToAny or to anyone else.
Nothing has to travel to a server and back, so the conversion starts the moment you press Convert, even on a slow connection.
No sign-up, no email address and no watermark. Add several files and download them together as a ZIP.
ICO is only understood as an icon; editors and websites want an ordinary image. AVIF gives the smallest files of any widely supported image format. ICO is at home in website favicons and Windows app icons; AVIF is the usual choice for the smallest images for websites.
The defaults suit most files. Under Options you can set the quality, aim for a target file size and resize the result.
If the icon file holds several sizes, the largest one is converted. The AVIF encoder is a WebAssembly module that downloads the first time you convert to AVIF and is cached afterwards.
An ICO file bundles the same icon at several sizes, such as 16, 32 and 48 pixels, so Windows or a browser can pick the sharpest one. It is still the most compatible way to ship a favicon.
Opens in Windows and every browser (as favicon.ico)
ICO converterAVIF stores a still image using the AV1 video codec. It usually beats both JPG and WebP on file size and supports transparency, HDR and wide colour. Current browsers display it, but many image editors, viewers and upload forms still do not.
Opens in Chrome, Firefox, Edge and Safari 16 or later; few desktop apps
AVIF converter| ICOIcon file | AVIFAVIF image | |
|---|---|---|
| Stands for | Windows icon | AV1 Image File Format |
| Type | Icon container | Raster image |
| Compression | PNG or uncompressed bitmaps inside | Lossy or lossless (AV1) |
| Transparency | Yes | Yes |
| Animation | No | Yes |
| Introduced | 1985, by Microsoft | 2019, by the Alliance for Open Media |
| Opens in | Windows and every browser (as favicon.ico) | Chrome, Firefox, Edge and Safari 16 or later; few desktop apps |
| Best for | Website favicons and Windows app icons | The smallest images for websites |
| File extension | .ico | .avif |
No. The ICO to AVIF conversion runs inside your browser, on your own phone or computer. The file is not sent to ToAny or to anyone else.
A little: ToAny writes AVIF in its lossy mode, so a small amount of detail is traded for a much smaller file. At the default setting the difference is hard to notice. You can raise the quality under Options; there is no lossless setting.
Yes. Add as many as you like, convert them together and download each result or all of them as one ZIP.
The steps are the same everywhere because ToAny runs in the web browser: open this page in a current version of Chrome, Edge, Safari or Firefox, add the ICO file, press Convert and save the AVIF. There is nothing to install.
Pictures of up to 120 megapixels are accepted (for example 12,000 by 10,000 pixels); a larger one is refused with a message. Beyond that the limit is your device's memory, since nothing is uploaded; a computer copes with large files better than a phone.