ICO to ICNS Converter
Create a macOS ICNS icon from the ICO image decoded by your browser. Conversion happens locally with no file upload.
Multiple inputs · shared settings · separate results
Drop an image here
Let’s make it just right.
ICO icon files 🔒 Processed locally — this file never leaves your device. Verify privacyHow to convert ICO to ICNS
1
Choose a ICO image
Select one ICO file. It stays on your device.
2
Convert in your browser
The fixed converter creates a ICNS without uploading the source.
3
Download the ICNS
Check the preview and save the converted image directly to your device.
FORMAT DETAILS
What changes when converting ICO to ICNS?
- The browser-decoded ICO image is used as the source; additional images stored inside the ICO are not preserved directly.
- The decoded artwork is fitted into square ICNS representations without stretching.
- ICNS sizes are generated up to the useful source size, with a maximum of 1024 px.
WHEN IT HELPS
Common reasons to use this converter
- Adapting a Windows icon for a macOS app or folder
- Packaging decoded ICO artwork into Mac icon representations
- Converting an icon locally without giving the file to a third party
ICO to ICNS questions
Are all images inside the ICO copied to ICNS?
No. The converter uses the image that the browser decodes, then generates a new ICNS size set from it.
Does ICO transparency remain transparent?
Yes, when the browser-decoded ICO image contains transparency.
Will the icon be stretched into a square?
No. Its aspect ratio is preserved and transparent padding is added when needed.