ICO converter is a simple online .ico image converter. It will take any image and convert it to ICO file, for web site favicon or Windows applications. Image file PNG, JPEG, GIF, BMP, etc. must be less than 4 Mb. Square aspect ratio recommendend. Sizes A single ICO file can store multiple resolutions. 16 pixels 32 pixels 48 pixels 64 pixels 128 pixels 256 pixels (only works with 32 bits)