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ICO

Windows Icon

ICO is a container holding several sizes of the same icon so Windows and browsers can pick the right one. A favicon.ico with 16, 32 and 48 pixel entries is still the most compatible favicon you can ship.

Extension: .ico
MIME type: image/x-icon

01 Convert ICO to something else

ICO to PNG Pulls out the largest image the icon contains.

02 Convert something else to ICO

PNG to ICO Real multi-resolution icon, transparency kept.
JPG to ICO Works, though a photograph makes a poor 16-pixel icon.

03 Related formats

JPG
JPEG
PNG
WebP
AVIF
GIF
BMP
SVG
HEIC

Opening a .ico file

If you landed here because something handed you a .ico file and nothing on your machine will open it, converting it to a format you already have a reader for is usually faster than installing new software. Every conversion above runs in this browser — the file is not uploaded, so it works on a locked-down work machine and on a file you are not allowed to send anywhere.