iMovie Help Page

How do I rotate a video?
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In iMovie 9 (or above) First add the portion of the clip you would like to use from your Library to the Project Timeline. Next select the clip and navigate to the iMovie menu bar > Window > Cropping, Ken Burns & Rotation. From your video window, click one of the rotation arrows and your video will rotate accordingly. Keep in mind that you will also be required to crop the video. You can also allow to keep black, if you need to fit everything you recorded.