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Split a movie into clips in QuickTime Player on Mac
You can split a movie into as many clips as you like. After you split a movie into clips, you can rearrange them.
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In the QuickTime Player app
on your Mac, choose View > Show Clips.
Move the playhead (the red vertical line) to the place where you want to split the clip (or use the Touch Bar), then choose Edit > Split Clip.
Your movie splits into two clips. Repeat until you have as many clips as you want.
When you’ve finished, click Done.