ICO converter
Convert your ICO files to any format.
What is a ICO file?
ICO is the Windows icon container — bundles several sizes in one file, still the format browsers expect for favicon.ico.
First released in 1985 by Microsoft, it uses lossless compression and transparency support, which makes it best suited to favicons and Windows application icons.
Drop a ICO file below and we'll show you every conversion available, each one processed locally on your device — nothing is uploaded to a server, so converting is instant and completely private.
Advantages of the ICO format
Several sizes in one file
An ICO bundles multiple resolutions (16, 32, 48 px…), so the system can pick the sharpest one for each spot — browser tab, taskbar, desktop shortcut.
The favicon standard
favicon.ico is still the most universally recognized way to give a website an icon, understood by every browser old and new.
Crisp and transparent
Built for tiny icons, it keeps a transparent background and stays sharp exactly where it matters most.
Convert ICO to…
Pick a target format — every ICO conversion runs instantly in your browser.
ICO: frequently asked questions
What sizes does the ICO include?
We pack the three favicon standards — 16, 32 and 48 px — into a single file, so browsers and Windows can each pick the right one.
Where do I put the favicon.ico?
Drop it in your website's root folder, and/or reference it with <link rel="icon" href="/favicon.ico">. Browsers also look for /favicon.ico automatically.
Is transparency kept?
Yes. Transparent backgrounds are preserved, so the icon sits cleanly on tabs and toolbars of any colour.
My image isn't square — what happens?
ICO icons are square, so we fit your image inside a square and centre it, keeping its aspect ratio. The surrounding area stays transparent.