Also good to know is that if you crop a picture in your iOS photos app and then airdrop it to someone, they can undo the crop in their photos app. It is a non-obviously non-destructive operation.
I am not sure as I mostly use android. Perhaps there is an app to help with that. On android, I use an app called Imagepipe[0] as the default app for sharing/opening images. It crops images destructively and removes exif information.