While the standard size is 16x16 pixels, we should also include 32x32 pixel favicons to accomodate retina screens. However, to fully support different platforms it is best to use a free favicon generator to create all the sizes. Common uses include: 16px for browser favicons, 32px for taskbar shortcuts, 96px for desktop shortcut icons, 180px for apple touch icons, 300px for Squarespace, 512px for Wordpress!