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Rotate or flip a clip in QuickTime Player on Mac
You can rotate a clip to the left or right, or flip it horizontally or vertically.
In the QuickTime Player app on your Mac, open the movie.
Choose View > Show Clips, then select the clip.
The selected clip is outlined in yellow.
From the Edit menu, choose to rotate the clip left or right, or flip it horizontally or vertically.
When you’re finished, click Done.