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Created September 10, 2023 04:19
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How to create an .icns macOS app icon
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macos-app-icon.md

How to create an .icns macOS app icon

How to make an application icon for macOS using iconset & iconutil

Steps

Saving images

Save your app icon with the following names & dimensions:

Name Dimensions
icon_16x16.png 16x16
icon_16x16@2x.png 32x32
icon_32x32.png 32x32
icon_32x32@2x.png 64x64
icon_128x128.png 128x128
icon_128x128@2x.png 256x256
icon_256x256.png 256x256
icon_256x256@2x.png 512x512
icon_512x512.png 512x512
icon_512x512@2x.png 1024x1024

Creating an .iconset

  1. Move all of the images into a new folder
  2. Rename the folder to: icon.iconset
  3. Confirm the file extension when prompted

This will convert the folder of images into an iconset, this can be verified by quick looking with the spacebar - a resizable preview of your icon should now appear.

Converting to .icns

  1. Navigate to the directory containing your icon.iconset in the terminal
  2. Run iconutil with the following command: iconutil -c icns icon.iconset
  3. Your icon.icns will be generated in the current directory
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Benitoite commented Sep 10, 2023 •
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Image-to-icns AppleScript droplet

on open the_files
	repeat with i from 1 to the count of the_files
		tell application "Finder"
			set myFileName to POSIX path of item i of the_files
			set exten to name extension of item i of the_files
		end tell
		set orig_path to POSIX path of (((path to me as text) & "::") as alias) as string
		set my_path to orig_path & "icon.iconset"
		do shell script "mkdir " & my_path
		do shell script "sips -z 1024 1024 " & myFileName & " -s format png --out " & my_path & "/icon_512x512@2x.png"
		do shell script "sips -z 512 512 " & myFileName & " -s format png --out " & my_path & "/icon_512x512.png"
		do shell script "sips -z 512 512 " & myFileName & " -s format png --out " & my_path & "/icon_256x256@2x.png"
		do shell script "sips -z 256 256 " & myFileName & " -s format png --out " & my_path & "/icon_256x256.png"
		do shell script "sips -z 256 256 " & myFileName & " -s format png --out " & my_path & "/icon_128x128@2x.png"
		do shell script "sips -z 128 128 " & myFileName & " -s format png --out " & my_path & "/icon_128x128.png"
		do shell script "sips -z 64 64 " & myFileName & " -s format png --out " & my_path & "/icon_32x32@2x.png"
		do shell script "sips -z 32 32 " & myFileName & " -s format png --out " & my_path & "/icon_32x32.png"
		do shell script "sips -z 32 32 " & myFileName & " -s format png --out " & my_path & "/icon_16x16@2x.png"
		do shell script "sips -z 16 16 " & myFileName & " -s format png --out " & my_path & "/icon_16x16.png"
		do shell script "iconutil -c icns " & my_path
		do shell script "mv " & orig_path & "/icon.icns " & orig_path & "/$(basename " & myFileName & " ." & exten & ").icns"
		do shell script "rm -r " & my_path
	end repeat
end open

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