How to rotate photos sent in whatsapp in iPhone 6s
To rotate a photo on an iPhone and share it with Whatsapp:


Go into the Photos app
Navigate to the photo you'd like to rotate &amp; share
Once viewing the photo in full screen, if the toolbar and navigation bar are not showing, tap the center of the screen
Hit the Edit button on the top-right (note: if you're running the iOS 10 Beta, you'll need to hit the slider button on the bottom toolbar)
Hit the crop &amp; rotate button (should be on the bottom left)
Press the rotate button (should be towards the bottom on the left) until the picture is rotated correctly
Hit the yellow Done button
Press the share/export button (should be in the bottom-left again)
If you don't see Whatsapp in the list of apps you can share the photo to, scroll all the way to the end of the app list to the more button, hit the more button, and turn Whatsapp on.
Exit out of the More menu and hit Whatsapp, at which point you can share your correctly rotated photo to Whatsapp.


Let me know if this helps!