.ICO File Extension

.ICO File Extension

File Type

Icon File

Developer Microsoft
Popularity
4.1  |  105 Votes
Category System Files
Format Binary

What is an ICO file?

An ICO file contains an icon, which is typically used to represent a Windows program, file, or folder. It stores one or more images in various sizes so they can be appropriately scaled depending on their use. ICO files are similar to .CUR files, which are also used in Windows, and .ICNS files, which are used in macOS.

More Information
Screenshot of a .ico file in File Viewer Plus 2
ICO file open in File Viewer Plus 2

All icons for executable files in Windows are saved in the ICO format. Windows ICO files typically store images ranging from 16x16 to 256x256 pixels. Older ICO files only include images up to 48x48 which was previously the recommended dimensions by Windows. However, most newer icons include images up to 256x256 to accommodate screens with higher DPI.

Each image in an ICO file with less than 32 bits of color depth stores two bitmaps: 1) the AND bitmap - the image mask (which determines what part of the icon is transparent) and 2) the XOR bitmap - contains the icon which is mapped onto the image mask. Images with 32 bits of color are 24-bit images with 8-bit channels for alpha compositing purposes.

Common ICO Filenames

favicon.ico - File used to store a small website logo that may appear in various areas of a web browser, including the address bar, website bookmark, and webpage tab. If a website has a favicon image, it will appear to the left of the web address when any page of the website is loaded. The favicon.ico image file must be 16x16 pixels and stored in the root directory of the website in order for the web browser to recognize it.

Open and view .ICO files with File Viewer Plus.Free Download

Programs that open ICO files

Mac
Linux
Free
iOS
Chrome OS
Updated March 1, 2019

Verified by FileInfo.com

The FileInfo.com team has independently researched the Icon file format and Mac, Windows, Linux, Android, and iOS apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

If you would like to suggest any additions or updates to this page, please let us know.