Rotating a video in iMovie is simple. First, create a project, import your clip, and drag it into the timeline. Select it.
If you’re on a Mac, click the Crop tool. Then click the white arrows, which are rotate buttons, to rotate the clip. Accept your changes.
If you’re on an iPhone or iPad, use two fingers to rotate the clip. Press them on the screen and spin them in the direction you want to rotate the clip. For example, to rotate the clip counterclockwise, twist your fingers counterclockwise.
And to rotate the clip clockwise, twist your fingers in that direction.