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What are the image viewers available in Kubuntu that are able to display all ICO sizes in a file?

In Windows 7 Picture Viewer, I can use PAGE UP / PAGE DOWN to navigate on the "mipmaps" (or whatever it's called) of an ICO file. It seems I can't do that on EOG, Gwenview, or even Pinta.

I'm looking for a viewer, but if you know of an editor that allows to edit each size independently, that would be nice too.

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Generally I like to use online applications when there isn't a concern about security and privacy. You can search on the Internet for an "online ico icon viewer". The one I just met seems to work properly:

https://redketchup.io/icon-editor

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GIMP will do it (I have version 2.10.18, but perhaps an earlier version can work as well). enter image description here

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    Ah I see, thanks! It's a weird choice to just treat the pages like layers, using the largest size, but hey, it works I guess! I'll mark this as accepted. Though it'd be better if each layer had a different size (or zoom) to facilitate design.
    – geekley
    Nov 19, 2022 at 3:07
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I use XnView MP.

It's closed source, but is an excellent tool for image viewing - among many other things, such as batch editing or some basic image manipulation.

In this picture, I have opened a .ico:

.ico opened with XNView

As you can see, it just shows the largest size.

If I click on 'View' and turn on 'Icon Snapshot' then I get to see all the different sizes, like this:

.ico opened with icon snapshot enabled

Alas, I do not see anywhere in it to edit each of them individually. It may be in there, but I'm not seeing it. XnView has a whole lot of features and has a Linux version that's easy to install. Just scroll down at the above link and you'll find a version that works for you.

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  • Well, I'm trying to avoid installing closed source that's not available as sandboxed snap or flatpak, but I'll upvote your answer. Thanks!
    – geekley
    Dec 19, 2020 at 23:51

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