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Looking for Image Combiner - PhotoScape Alternative
(lemmy.world)
This is a most excellent place for technology news and articles.
Obvious answer but gimp can be used. To my knowledge there is no inbuilt way to do this quickly but it is a trivial amount of work to achieve the same result.
Not trivial if you've to do it dozens of times. At some point I automated the task with ImageMagick but that's also more pain than gain as most times I need to preview the output and adjust the number of cols/rows.