Turn ICO files into WebP
Drop in an ICO and get a WebP back. WebP gives you the same picture in a noticeably smaller file than JPG or PNG, usually a quarter to a third smaller. Your file never leaves your computer.
Need the other direction? Convert WebP to ICO
How to convert ICO to WebP
- 1 Drop your ICO .ico file onto the page, or click to browse for it.
- 2 Set the quality, or leave the default, which keeps the file small without anything showing.
- 3 Convert. The work happens on your own machine, so how long it takes depends on your computer and the file.
- 4 Download the WebP, or add more files and do the whole set in one go.
Why convert ICO to WebP
- Substantially smaller than JPEG and PNG at matching quality.
- One format covers photos, flat graphics, transparency and animation.
- Short animations that would otherwise be a bloated GIF.
- ICO: each picture inside it is capped at a small size.
ICO compared with WebP
How the two formats differ on the things that decide whether a conversion is worth making.
| Property | ICO | WebP |
|---|---|---|
| File extension | .ico | .webp |
| Animation | No | Yes |
| Multiple pages | Yes | No |
| Colour depth | Up to 32-bit with alpha | 8 bits per channel |
| Size limits | 256 x 256 pixels per entry | 16383 x 16383 pixels |
| Introduced | 1985 | 2010 |
| Developed by | Microsoft | |
| Standard | Proprietary | Open |
Quality and what changes
WebP stores the same content under a different set of rules, so what matters here is compatibility rather than picture quality. Convert once from the best source you have rather than through a chain of intermediate files.
- A multi-page ICO produces one WebP per page.
- One WebP limitation to keep in mind: older desktop software and some print workflows still refuse it.
Questions about ICO to WebP
Is there a maximum size for WebP?
Yes, WebP is limited to 16383 x 16383 pixels. Images beyond that have to be scaled down or split before they can be written, which is a property of the format rather than of this tool.
What happens to a multi-page ICO?
WebP holds one page, so each page becomes a separate file and you get the set as a ZIP. Nothing is discarded, it just cannot stay in a single document.
Is my ICO file uploaded anywhere?
No. The whole thing runs inside the browser tab you already have open. Your ICO is read straight from your own disk, converted on your machine and handed back as a WebP. Nothing is sent anywhere, nothing is stored and there is no account.
Is there a file size limit?
There is no server-side limit because no server sees the file. The real ceiling is your device memory, since the input and the output both have to fit in the tab. A few hundred megabytes is usually fine on a desktop machine and considerably less on a phone.
Can I convert several ICO files at once?
Yes. Add as many as you like and they are processed one after another, then offered as separate WebP downloads or as a single ZIP. Speed depends on your own processor rather than on a queue.
Does the converter work offline?
Yes, after the page has loaded once. The engine is cached by the browser, so you can disconnect, reload and keep converting. That falls out of doing the work locally rather than being a separate mode you switch on.