# ICO to WebP

Convert an ICO icon to WebP for the web, with transparency kept. You get the largest size stored in the file, free, and nothing is uploaded.

Canonical page: https://filetity.com/ico-to-webp

## Capabilities

- Free: Yes, with no watermark and no page limit.
- Account required: No. There is no account system.
- Processed on device: Yes. The file is read by your browser and never uploaded. There is no server to send it to.
- Formats: ICO in. WebP out, one file per image, or a ZIP when you convert several.
- Limits: No image count limit. Only the largest size in the icon comes out; the smaller copies are dropped. WebP is lossy at the default quality, so raise it if the icon's edges start to look soft.
- Mobile: Yes, on any modern mobile browser. Large files are limited by the memory the phone gives the browser.
- Offline: Yes, after you have used it once. Your browser keeps what the tool needs, so it then works with no network connection.

## Questions

### Which size comes out?

The largest one the icon holds. Measured in Chrome on 2026-09-06 against a four size ICO, the browser returns the 256 pixel copy and ignores the rest, whichever order they appear in.

### Is a lossy format right for an icon?

Not at the default setting. An icon is flat colour and hard edges, and lossy compression softens exactly those. Raise the quality, or use PNG, which stores the icon exactly and is often smaller than a high quality WebP for this kind of picture.

### Does transparency survive?

Yes. WebP has a real alpha channel, so the clear area around the icon stays clear.

### Why not just use the ICO on my site?

Browsers do read ICO, which is why favicons still work. But an ICO is a container of square sizes, so it is awkward as a page image, and its compression is decades behind WebP. For anything other than the favicon slot, a WebP or a PNG is the better file.

### Can I get a smaller WebP than the icon's largest size?

Not here. The resize menu starts at 640 pixels, and an icon is never larger than 256, so those steps change nothing on this page. Convert first, then take the WebP to the Image Resizer, which goes down to any width you type, for a 64 or 32 pixel version.

## Related tools

- [ICO to PNG](https://filetity.com/ico-to-png): Turn a Windows ICO icon into a PNG, transparency and all.
- [PNG to WebP](https://filetity.com/png-to-webp): Turn PNG and JPG images into WebP, which usually lands smaller at the same quality.
- [AVIF to WebP](https://filetity.com/avif-to-webp): Turn AVIF images into WebP, which more tools and older browsers accept.