favicon.ico browser implementation

The following table illustrates major web browsers supporting different features. The version numbers indicate the starting version of a supported feature.

File format support

The following table illustrates the image file format support for the favicon.

BrowserICOPNGGIFanimated GIFsJPEGAPNGSVG
Firefox1.01.01.0YesYes3.0No
Google ChromeYesYes4.04.04.0NoNo
Internet Explorer5.011.011.0NoNoNoNo
Opera7.07.07.07.07.09.5Dropped
SafariYes4.04.0No4.0NoNo

Additionally, such icon files can be 16×16, 32×32, 48×48, or 64×64 pixels in size, and 8-bit, 24-bit, or 32-bit in color depth. The ICO file format article explains the details for icons with more than 256 colors on various Microsoft Windows platforms.



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