An icon for a web application manifest
WebP keeps the transparency and reduces the download. Check the size the container yielded is large enough for the largest place it will appear.
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Use ICO to WebP
Your image is decoded and re-encoded on this device. No upload request is made.
WebP preserves transparent pixels. Maximum quality minimizes further loss, but browser encoders do not guarantee mathematically lossless WebP.
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Browse all image toolsAbout ICO to WebP
WebP sits between the other two options for an icon and often wins on the practical measures. Like PNG it carries a full alpha channel, so the transparency that makes an icon usable survives and the anti-aliased edges stay soft. Unlike PNG it compresses aggressively, which matters when the icon is destined for a web page where every request counts. The usual reason to convert an ICO at all is that something modern needs the image in a modern format: a web application manifest, a component library, a design system that stores its assets as ordinary images rather than icon containers. For those, WebP is a sensible target. For anything being handed to a person rather than served by a site, PNG remains the safer choice because its support is universal.
Shape and export choices
- The ICO container is decoded and the browser picks one of the images inside, typically the largest available.
- A transparency-enabled canvas is created at that size and the icon drawn onto it with no background.
- The result is encoded as lossy WebP at a high quality setting, with the alpha channel preserved.
- Soft anti-aliased edges survive, since WebP records partial transparency rather than the on-or-off transparency older formats used.
- The output dimensions are reported, which reveals which size the container yielded.
Good fits for ICO to WebP
Modernising a set of legacy icons
Converting a folder of ICO files to WebP gives a consistent, small, transparent set for use in a modern interface.
Check the image before download
- The encoding is lossy. On the hard edges of an icon that can be faintly visible, so PNG is better when the icon must be pixel-exact.
- Icons are small, and at very small sizes the format overhead means WebP may not beat PNG on file size.
- Only one image is extracted from the container, and which one is decided by the browser.
- Some older software and email clients do not read WebP, making it unsuitable for files sent to others.
- Enlarging the result will look soft. Icons are stored small, and no conversion adds detail that was never there.
Questions about ICO to WebP
WebP or PNG for an icon?
WebP for a web page, since it is smaller. PNG when the icon will be edited, shared, or must be exactly pixel-perfect.
Is the transparency kept?
Yes, including soft edges, because WebP supports partial transparency.
Which size comes out?
The one the browser selects from the container, normally the largest. It is shown after conversion.
Is anything lost?
Slightly. WebP here is lossy, which is usually invisible but can soften the hardest edges of an icon.
Does the icon leave my device?
No. It is decoded and re-encoded entirely in this tab.
Related tools
ICO to PNG
Convert a Windows ICO or favicon to PNG in your browser, keeping the transparency that makes an icon usable.
ICO to JPG
Convert an ICO icon to JPG in your browser. Transparent areas become white, as JPEG requires.
PNG to WebP
Convert PNG to WebP in your browser. Transparency survives the conversion, unlike PNG to JPG, and the file usually gets much smaller.