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Source code and details: https://git.anarchists.space/nemesis/PixelCloak
Features:
- No permissions required
- Reduces effectiveness of reverse image search
- Randomizes filename
- Removes EXIF metadata
- Censors any detected faces — choose between black box or emoji overlay
- Emoji picker with 60+ emoji options for face censoring
- Written in Java
This isn't a bad first effort, but I don't know if it's possible to undo filters, and it might be good to let people place extra censors on top too.
On the privacy side, it's plenty safe to run. (The only permission is "view networks", and without any others there's no real way for it to leak anything). It's cool there's automatic face detection built into this, although it didn't work for one of my test images. Thus my desire for manual censor placement.