ICO File Documentation

Overview

Feature Value
Format Type Bitmap
File Extension .ico
MIME Type image/x-icon
Developed by Microsoft
Container for Icons
Introduction Windows 1.0
Supports Transparency Yes
Supports Animation No (static images only)
Maximum Dimensions 256x256 pixels
Color Depth Up to 32-bit (including alpha transparency)
Standard ICO file format
Compression Optional (PNG compression)
Channels RGBA (Red, Green, Blue, Alpha for transparency)
Icon Variants Multiple sizes and color depths in one file
Used for Application icons, Website favicon
Can Store Multiple images
Multiple Resolutions Supported
Operating System Primarily Windows
Also Known As Windows Icon File
File Signature 00 00 01 00