Jpg for photos, png for everything else.

It’s an easy rule of thumb, it hurts that 20 years of repeating it seems to have had zero effect.

Maybe this helps: Jpg fucks up your image, and png doesn’t.

Or: jpg is lossy, png is lossless.

Or: It’s better to save photos as png than cartoons as jpg.

Seriously, I hope some of this breaks through because deep fried images are so fucking unnecessary.