Convert ICO to WebP
Extracts the image from an icon file and saves it as WebP — the right pick when a favicon needs to appear inside a page: a docs site, a link list, a design mockup. The icon’s alpha channel survives, so transparent corners stay transparent, and the file comes out smaller than the same image as PNG.
Need the other direction? Convert WebP to ICO (favicon)
How it works
Queue the .ico files — a whole directory’s worth of collected favicons works in one go.
Each primary entry re-encodes to WebP at quality 90 with its transparency carried over untouched.
Wire the compact results into your page or grab them all zipped; alpha edges stay clean on any background.
ICO vs WebP
One extracted icon makes this conversion look pointless — a kilobyte saved — but multiply by the two hundred favicons on a links dashboard and WebP’s discount becomes real bandwidth. Verdict: a bulk-pipeline tool, with PNG remaining the right single-file answer.
| ICO | WebP | |
|---|---|---|
| Compression | Lossless (BMP or PNG entries) | Lossy or lossless |
| Transparency | Yes (full alpha) | Yes (full alpha) |
| Animation | No | Yes |
| Support | Universal for favicons | All current browsers (since 2020) |
| Best for | Favicons and Windows app icons | Web images: photos, thumbnails, UI assets |
Frequently asked questions
No — that is the whole reason I built this. The conversion runs in your browser using WebAssembly, so your files never leave your device; there is no server in the loop at all. It also means the tool keeps working offline once the page has loaded, and there is no file size limit beyond your device’s memory.
Size, mostly — WebP stores the same small image with alpha in fewer bytes, which adds up when a page shows dozens of site icons (think bookmark dashboards or link directories). If the image is headed into an editor rather than a web page, PNG’s universal support wins instead.
Yes — WebP has a full 8-bit alpha channel, so both hard-edged classic icon transparency and the soft anti-aliased edges of modern icons are preserved exactly. The extracted icon sits cleanly on any background color.
The primary entry as your browser decodes it — typically the largest image in the file. Favicons commonly top out at 32 or 48px, so expect a small output; the tool preserves whatever resolution the source actually contains.
Multiplication. One favicon as PNG versus WebP saves a kilobyte or two — irrelevant. A link directory or bookmarks dashboard rendering 200 site icons saves a few hundred KB and a chunk of decode time, with alpha intact either way. Below a dozen icons, use ICO to PNG and spend your optimization energy elsewhere.
When the icon is headed anywhere except a web page — editors, documents and OS uses all prefer PNG’s universal support, and WebP buys nothing there. Also for one-off use: the bytes saved on a single 48px image will never be noticed. This is a pipeline tool for sites that render icons in bulk, not a sensible default.
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