I use Photopea for this. It's a free Photoshop clone on the web so it's not quite as simple, but stacking photos and resizing the canvas is easy when you get used to it.
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Does anyone know if Photopea is Open Source? I can't really find much on it.
It's closed source.
alternativeto.net is my go to resource. I don't know about this software or alternatives, so I hope this helps.
Thanks for the suggestion. The best alternative I was able to find in that website was https://bggenerator.com/batch_image_combiner.html however it is payed and doesn't show a preview of the output.
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.
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.
Figma