Mastodawn

TIL: You can export Icon Composer .icon files from the cli tool
Icon Composer ships with ictool — buried inside the bundle:

/Applications/Icon https://Composer.app/Contents/Executables/ictool

Export any appearance at any size

ictool MyApp.icon --export-image --output-file icon.png \
--platform macOS --rendition Default \
--width 1024 --height 1024 --scale 1

The --rendition flag lets you export all 6 icon appearances individually

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Leo Dion 6d ago

Great for automating web assets, favicons, and press kits from a single .icon source file — no manual exports needed.

Thanks to @johnbrayton for documenting ictool:
https://virtualsanity.com/202507/icon-composer-notes/

Icon Composer Notes

I talk about working with Icon Composer and the changes to icons for Apple’s OS 26 releases.

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Stewart Lynch 🇨🇦6d ago

@leogdion @johnbrayton This is fantastic. In 15 minutes I vibe coded an app that now extracts all the images I need for my YouTube Videos and resesources for my project launch screens

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Leo Dion

@StewartLynch @johnbrayton Nice! here's some of the script I used for my app if you find it helpful:
https://gist.github.com/leogdion/f9330d9f624c6b623306648bfe23c8f5

Export Icon Composer Icons for Press Kits and Web Sites

Export Icon Composer Icons for Press Kits and Web Sites - generate-icons.sh

Gist