All you need to do is import an image, select the app platform(iOS, macOS or Apple Watch) then generate a complete set of icons & export based on your choices.
App Icon: Resizer for all OS App help to import any image & convert it into a complete & ready-to-use app icon.
It supports every type of icon you'll ever need for any of Apple's platforms; iOS, iPadOS, watchOS, tvOS and macOS.
# Updated for all the latest devices iOS 16 with iPhone 14, Apple Watch Series 8, iPad Pro icons, Ventura Catalina etc.
It can make any icon within your app; converting your image into all the required 1x, 2x(retina) & 3x formats & image set.