ICNS Converter
DevConverter converts your image files online. Amongst many others, we support PNG, JPG, GIF, WEBP and HEIC. You can use the options to control image resolution, quality and file size.
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ICNS
The Apple Icon Image format (ICNS) is used for icons on Apple's OS X. It supportes the storage of various resolutions (16x16x up to 1024x1024) in one single ICNS file. Also, it supports the storage of several images for different states.