Smartphone camera usually choose speed over size, e.g. photos taken are often 5MB~10MB, but effective information is usually only 10%~20% of the size. Screenshots are better on some Android but much worse on iOS.

I decided to create a simple opinionated Android app to compress these images, because there isn’t one with simple enough UX, and I’d use these predefined the compression algorithms and levels(ok/good/great => input q => Scale-factor / Butteraugli):

  • mozjpeg: for screenshots, ok/good both great
  • jpegli: photos, good means good enough

savings from compression

It’s fast, and I’m quite happy with the savings, I always compress before backing them up using Ente.

The app is available on F-droid, source codes and issue tracker are hosted on sourcehut, codes and APKs are also mirrored on Github.

Any feedback is welcomed. If you enjoy writing correct and performant codes to help it run on even older devices, there’s also an open issue on memory pressure to have some fun with.