ico
What is a .ico file?
image/x-icon
ICO is a Windows icon container that bundles multiple image sizes and bit depths in a single file so the system can pick the best resolution. Each entry is stored as a BMP-style bitmap or embedded PNG, commonly at sizes like 16, 32, and 48 pixels. It is the traditional format for application and website favicons.
How to use a .ico file
Use an example ICO to test favicon and icon extraction, multi-resolution selection, and converters that build ICO files from PNG sources.
Download example .ico files
- ICO: Multi-Resolution App IconA Windows ICO containing four square sizes (16/32/48/64 px) of a simple app glyph: the classic favicon/desktop-icon container. Handy for testing icon extraction and multi-size rendering.
- Favicon Pack: Multi-size ICOWindows ICO containing 16/32/48 favicon sizes of the synthetic mark, for ICO parsers and extractors.
- Head and shoulders portrait of a black (ico multisize)The same 512x512 photograph written as ico multisize. One file holding four resolutions; a reader that takes the first gets 16 pixels. Every member of this group is identical pixels, so a decoder returning different dimensions or a different pixel count has lost something rather than simply produced a different file; the 24-bit PNG in this group is lossless and is the reference the lossy members are measured against Source plate a-av-f3.
- A Black man in his seventies with grey (ico multisize)The same 512x350 photograph written as ico multisize. One file holding four resolutions; a reader that takes the first gets 16 pixels. Every member of this group is identical pixels, so a decoder returning different dimensions or a different pixel count has lost something rather than simply produced a different file; the 24-bit PNG in this group is lossless and is the reference the lossy members are measured against Source plate p-market-sen.
- Silver sedan parked on a suburban (ico multisize)The same 512x512 photograph written as ico multisize. One file holding four resolutions; a reader that takes the first gets 16 pixels. Every member of this group is identical pixels, so a decoder returning different dimensions or a different pixel count has lost something rather than simply produced a different file; the 24-bit PNG in this group is lossless and is the reference the lossy members are measured against Source plate v-car-sedan.
- Overhead plate of fresh pasta with (ico multisize)The same 512x512 photograph written as ico multisize. One file holding four resolutions; a reader that takes the first gets 16 pixels. Every member of this group is identical pixels, so a decoder returning different dimensions or a different pixel count has lost something rather than simply produced a different file; the 24-bit PNG in this group is lossless and is the reference the lossy members are measured against Source plate f-plate-pasta.
- Flat red brick wall (ico multisize)The same 512x341 photograph written as ico multisize. One file holding four resolutions; a reader that takes the first gets 16 pixels. Every member of this group is identical pixels, so a decoder returning different dimensions or a different pixel count has lost something rather than simply produced a different file; the 24-bit PNG in this group is lossless and is the reference the lossy members are measured against Source plate t-tex-brick.
- Smooth abstract gradient, deep teal to (ico multisize)The same 512x341 photograph written as ico multisize. One file holding four resolutions; a reader that takes the first gets 16 pixels. Every member of this group is identical pixels, so a decoder returning different dimensions or a different pixel count has lost something rather than simply produced a different file; the 24-bit PNG in this group is lossless and is the reference the lossy members are measured against Source plate t-grad-cool.
and 3 more in the library.