I'm looking for something very simple. I want to take two image files that are the exact same size, format, etc., place them side by side and join them to create a joined image. I don't need a panorama software that warps or does complicated matching things to it. Everything is already matched and ready to go. I just need to place them next to each other and join.
I know photoshop and gimp already do this manually, but is there something premade for this? I'm going to do it a lot. Ideally, I just drag the two files in, say where I want to join and it joins. Anything?