Convert an image to ICNS
Turn a PNG, or any image, into ICNS. macOS apps carry their icon as an .icns file, and ConvertICO renders each size Apple asks for, from 16 up to 1024, then assembles them into one .icns you can hand to Xcode.
Drop a square image, or
1024px square gives the sharpest result. Nothing is uploaded.
How it works
A macOS app carries its icon as a single .icns file with every size packed inside, from the 16-pixel one in a list view up to the 1024 artwork Finder uses at full zoom. Drop an image and ConvertICO renders each size Apple asks for, stores them as PNG blocks, and assembles the .icns in your browser. Hand the result to Xcode, or set it as a folder icon. As with every tool here, the source image is read locally and never sent anywhere.
Runs entirely in your browser. Your file is never uploaded.