I actually built it on CustomTkinter in Python, as that was a language I already know.

Impressive for CustomTkinter. Well done with the UI design.

Thanks! Otherwise I'd need to start learning C++ ...

Fair point. Do you have any recommendations on how to do this alternatively, for Windows? I defaulted to .exe but obviously didn't think about the user perception of it.

Like the user above says, a web service using CSS/JS for the image manipulation (you can get quite good perf with CSS these days)

Thanks for your feedback, yea I got to admit there's a bit of sales language there. Hopefully I'll incorporate some more features in the future. At the moment I need to sort out something I missed - perception of a one file .exe file.

Thanks for the feedback. I'm actually a bit new to product development. What would be a recommended alternative to an executable in this case? After reading some of the other comments I'm aware of the perceived security risk.

To a web app guy, everything looks like a nail sort of thing but I think this would be a neat web app. I can go to https://photopea.com and get an entire photoshop clone in my browser, but it would be nice to just use your tool for screenshots when I need.