Any photo editor will do. Just load it in and export as JPEG or smaller resolution.
On f-droid:
Pocket Paint is crashy for me, but it gets the job done.
Imagepipe has a bit clunky interface but just to load and export it works fine. Its primary advertised purpose is to remove metadata from photos, so not a bad thing to have on hand anyway.
Yeah that's a good segment about it. Recently Pinely released one with some fun tidbits of Guiness shenanigans: How Guiness RUINED World Records
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Why does this sound threatening?
(ahh thanks for the archived link)
@person
@lemm.ee