How to bulk rotate photos?

[Sloth99]

I have way too many photos that need to rotate. I took them in portrait but the gallery auto rotate it. This feature takes way too long. Each photo I need rotate three times and include edit button and save I need click a total 5 times per image

[pat_techwatchlist]

I don't think it can be done with the built-in editor. You may need to download an app like Snapseed.