How to trim a screen recording on a Mac

Cut the beginning and end in QuickTime

Apple specifies that material outside the yellow handles is removed. A simple Trim keeps one continuous span; it does not remove a mistake from the middle while preserving footage on both sides.

1. Find the saved .mov file. Duplicate it in Finder before editing, then open the copy in QuickTime Player. If the file is missing, check the Screenshot Save to location first.
2. Choose Edit → Trim. A filmstrip appears with yellow handles at both ends.
3. Drag the left handle past the setup you want to remove and the right handle before the ending you want to cut. The area between the handles stays in the movie.
4. For a finer cut, click and hold a handle to inspect individual frames, then click Trim.
5. Choose File → Save, then play the first and last few seconds of the edited copy to make sure the cut is right.

Sources: Apple: Trim a movie or clip in QuickTime Player · Apple: Save or rename a recording in QuickTime Player

Remove a mistake from the middle

Apple documents Split Clip for dividing a movie into multiple parts. This is more precise than shortening the whole recording when the mistake is surrounded by footage you want to keep. Review the join after saving; a sentence or cursor movement may feel abrupt if the cut is too tight.

1. Work on a duplicate of the original movie. In QuickTime Player, choose View → Show Clips.
2. Move the playhead to the start of the unwanted section and choose Edit → Split Clip.
3. Move it to the end of that section and split again.
4. Select the unwanted clip, delete it, click Done, then save the edited copy.

Sources: Apple: Split a movie into clips in QuickTime Player

Trim, split, or use a timeline editor?

QuickTime is enough for a clean handoff clip. A tutorial with multiple retakes, camera overlays, effects, or captions benefits from an editor with tracks. Choose the simplest workflow that produces the video your viewer needs.

Check the edited file before sharing

A preview inside the editor is not a substitute for checking the file you will actually send. If the exported file is unexpectedly large, its duration and bitrate are the main inputs to estimate.

• Watch the opening and ending at normal speed, including the first spoken word.
• Listen through the cut so a sound does not end in the middle of a word.
• Confirm that confidential tabs or notifications are absent from the entire saved video.
• Open the saved copy from Finder before deleting any original footage.