There are a lot of these: 
https://www.ecosia.org/search?q=app+screenshot+generator

I also used: https://theapplaunchpad.com/
https://appinstitute.com/app-screenshot-maker/
and http://www.appscreenshot.me/

Although they change frequently so I have no idea if they're still 
good/free.

Generally you give one screenshot with a good aspect ratio. When you're 
done it generates a zip file that includes directories for every 
resolution/device skin. 

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