What is a ICO file?
ICO (Windows Icon) is the icon container that holds several sizes of one image, used for Windows apps and website favicons. It was introduced in 1985 by Microsoft.
What ICO is good at
- Multiple sizes in a single file
- Works as a favicon
- Supports transparency
Where ICO falls short
- Maximum size of 256x256 pixels
- Only for icons
When to use ICO
- Website favicons
- Windows application icons
- Desktop shortcuts
Where ICO files open
ICO files open in Windows, every browser (favicon) and most editors.
ICO compared with PNG
ICO or PNG? ICO is best for website favicons. PNG is best for screenshots and UI graphics. Convert ICO to PNG or convert PNG to ICO.
Frequently asked questions
What is a ICO file?
ICO (Windows Icon) is the icon container that holds several sizes of one image, used for Windows apps and website favicons. It was introduced in 1985 by Microsoft.
What are the advantages of ICO?
Multiple sizes in a single file; works as a favicon; supports transparency.
What are the drawbacks of ICO?
Maximum size of 256x256 pixels; only for icons.
What programs open ICO files?
ICO files open in Windows, every browser (favicon) and most editors.
How do I convert a ICO file?
Choose the ICO converter you need from the list on this page, drop in your file and press Convert. You get your new file in seconds, free and without sign-up.