For years, iPhone users needed to download a third-party video editor app to rotate videos. With the launch of iOS 13, users can fix the orientation of videos from the built-in Photos app. Here’s how.
Start by opening the “Photos” app on your iPhone. If you can’t find the icon, swipe down on the home screen and use Spotlight search to find the app.
Scroll down to the “Media types” section and tap on “Videos.” Alternatively, you can select the “Recents” album.
Locate the video that you want to rotate. Tap on the file to view the expanded video.
Select the “Edit” button found in the top-right corner of the display.
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Source : How to Rotate iPhone Videos Without Installing an App
