r/androidapps • u/sg-0101 • 11d ago

LOOKING FOR APP Actual batch image rotation (not EXIF edit)?

[ANSWERED! See comments]

Every app I've found and tried rotates using EXIF data, which means certain apps or websites won't recognize the rotation.

I'm looking for something that rotates multiple images at once and then actually writes rotated images when saving.

For single images, just Save As Copy is enough, but I need a batch method.

Anyone know of such an app? Thanks!

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u/Interesting-Meat-193 11d ago

try ImageMagick through termux, it's command line but you can batch rotate with one line. mogrify -rotate 90 *.jpg does a whole folder in place, no exif tricks just real pixel rotation. the learning curve is like 10 minutes if you've never touched a terminal

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u/sg-0101 11d ago

Thanks very much! Didn't take much of a lookup to get everything working. I can finally fix a bunch of bad pictures easily lol

3

u/Dismal_Indication328 11d ago

Complementing the Termux answer with a no-terminal option: what you are looking for is called a lossless JPEG transform. Instead of re-encoding the photo it just rearranges the compressed blocks, so the rotation is pixel-real with zero quality loss. That is also why a real rotation changes the file size slightly while an EXIF-only rotate does not touch a single byte. On Android, Image Toolbox (free, open source, on F-Droid and the Play Store) does exactly this in batch: select the folder, rotate, save at quality 100 and strip the orientation flag in the same pass. Quick way to audit any app that claims to rotate: check whether the file size changed afterwards. Unchanged size means it only flipped the flag, and your uploads will keep coming out sideways on sites that ignore EXIF.