> I personally recommend blacking out (add a black rectangle) instead of blurring I've seen people use image editors on mobile and they'll "scribble" out sensi

> I personally recommend blacking out (add a black rectangle) instead of blurring I've seen people use image editors on mobile and they'll "scribble" out sensitive information, but one of the problems is that if you pick the wrong pen it'll blend your strokes so it's not 100% opacity (but on a casual glance it's close enough). You can zoom in and change the contrast of a photo that has been redacted this way and recover information.