You can use the tools in the Photos app to crop, rotate, flip, straighten, or adjust the size of a photo or video on iPad.
When you use on the left side of the screen, then do any of the following:
Tap Done to save your edits, or if you don’t like your changes, tap Cancel, then tap Discard Changes.
To quickly crop a photo while you’re viewing it, pinch the photo to zoom in. When the photo appears as you want it cropped, tap Crop in the top-right corner of the screen. Make any further adjustments with the crop tools, then tap Done.
You can straighten a photo or video, or tilt it vertically or horizontally.
Go to the Photos app , then tap Revert.
If you have an Use Markup to add text, shapes, stickers, and more to documents on iPadApple Support article: How to edit with third-party apps and extensions in Photos