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.ICO File Extension

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File TypeIcon File

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CategorySystem Files


This file is saved in a binary format, which requires a specific program to read its contents.

What is an ICO file?

An ICO file is an image format used to store icons for Windows programs, files, and folders. It contains 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. ICO files can be modified to create custom icons.

More Information

The "favicon.ico" file is used to store a small website logo that appears in the address bar of a Web browser. If a website has a favion.ico 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.

An ICO file is similar to a Windows cursor (.CUR) file, but has a different identification byte in the header.

Common ICO Filenames:

favicon.ico - A 16x16 pixel .PNG file located in the root directory of a website and containing a small icon graphic to be displayed in the Web browser's address bar.

Programs that open ICO files
Microsoft Windows LogoWindows
Axialis IconWorkshop
Newera IconCool Editor
ACD Systems ACDSee 18
SibCode Sib Icon Editor
Program4Pc PC Icon Editor
Mac OS X LogoMac
Apple Preview
Lemkesoft GraphicConverter
Snap Converter
Linux LogoLinux
Android LogoAndroid
File Viewer for Android
Updated 5/18/2016