App screenshots - PNG or JPG?

👋 Hey, folks. Does Apple convert app screenshots uploaded to App Store Connect before displaying them on the App Store?

In other words, is it better to upload PNG files for better quality or JPG files for lower file size and faster loading?

I always use png. I think it is safer (note that's the format generated by simulator screen shots).

Thanks. Good point about the simulator. I just started to wonder because I noticed my screenshots sometimes need a while to load when I’m checking my apps in the App Store app. And I always use PNG files which are often much bigger than JPG.

App screenshots - PNG or JPG?
 
 
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