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ICO file extension is a container file format that may include several icon images of different sizes. I'd like to know how I may access and view what is inside a ICO file, i.e. the different images it contains, and possibly any metadata.

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The built-in Preview.app can handle ICO files and show the contents of the container. It can also show the file metadata. To view file metadata, use the keyboard shortcut, Command + i.

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Right click on one of the images, select Export As... and select the desired format.

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  • Nice! Thank you, Nimesh. I would have a subsidiary question: why, when I right-click on the ICO icon in the Finder, don't I see 'Show Contents'? – Olivier de Broqueville Nov 3 '18 at 14:04
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    @OlivierdeBroqueville Because ICO file is not formatted as macOS bundle. – Nimesh Neema Nov 3 '18 at 14:05

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