How to Cut Audio in iMovie on Mac and iPhone

To cut audio in iMovie, select the audio clip and trim an edge, or position the playhead and split the clip into sections. On Mac, select the clip and use the Split Clip command; on iPhone, tap the audio clip, then Actions → Split. Listen across the edit and check the final export.

First decide what you mean by “cut”: shortening the beginning or end, removing a middle section, or detaching a video's soundtrack are different operations. A timeline edit does not automatically create a standalone audio file, and cutting a mixed soundtrack affects all sounds inside the selected section.

Choose the right edit

Goal	Starting action	Check afterward
Shorten the beginning or end	Select the audio clip and move its edge or trim handle.	The first word, attack and final tail remain complete.
Remove a section in the middle	Split at both boundaries, select the unwanted section and delete it.	The gap, remaining timing and transition with the picture.
Edit video sound independently	Detach the clip's audio to a separate timeline layer first.	That the audio still lines up with the source picture.
Keep only a voice or instrument from a mixed sound	A simple time cut is not source separation.	Use separate original tracks if available; an estimated source can contain bleed or lose detail.

How to cut audio in iMovie on Mac

1. Open the project. Locate the audio clip in the timeline and listen to the passage you want to change. Zoom in enough to place the edit deliberately.
2. Trim an outer edge. Select the audio clip and adjust its beginning or end to retain the wanted passage. Listen from before the new boundary to confirm a word or note was not cut short.
3. Split in the middle. Select the clip and position the playhead at the desired cut. Choose Modify → Split Clip or press Command-B, as documented in Apple's keyboard shortcuts.
4. Remove an unwanted interval. Split again at its end, select only the unwanted segment and delete it. Check what happens to the remaining clips and their positions; undo if the result is not what you intended.
5. Play through the edit. Listen for clicks, missing syllables and timing changes, then inspect the ending of the project.

If the audio is still attached to a video clip and you need a separate audio edit, select the video and choose Modify → Detach Audio. Apple's detach-audio guide says the resulting audio-only clip appears below the video. Detaching changes the timeline arrangement; it does not unmix speech, music and effects in the soundtrack.

How to cut audio in iMovie on iPhone

These steps are for a movie project. Apple's iPhone audio-editing guide describes both trimming and splitting an audio clip; controls can differ in other project types or versions.

1. Open the movie project and find the audio clip beneath the video timeline.
2. To shorten its start or end, tap the audio clip and drag the yellow trim handle at the relevant edge. If a handle will not extend, Apple notes there may be no additional audio at that end.
3. To cut in the middle, scroll the timeline until the playhead is at the intended point. Tap the audio clip, tap Actions, then Split.
4. For an unwanted interval, split at its other boundary and remove the selected section. Play from before the first edit through the next phrase and check what happens to the timing.
5. Preview the project and its exported video. Test both the first and last edit, not just the middle of the timeline.

If the sound belongs to a video clip, first use the available detach or audio-only workflow when you need an independent audio layer. The iMovie audio-detachment guide explains the distinction between a timeline layer and a separately saved audio file.

Keep dialogue and picture in sync

Before cutting, note the original position and compare a visible cue, such as a mouth movement or a hand clap, with the sound. Deleting time from only one layer can change the relationship between the remaining sound and picture. If the picture must stay continuous, consider whether the unwanted sound can be muted or replaced while preserving the interval; listen for the resulting gap and any missing ambience.

After editing, check a cue near the beginning and another near the end. An offset present throughout suggests a different problem from timing that gradually drifts. The audio replacement guide covers source in-points, timeline placement and final sync checks.

Fix a click or abrupt transition

A sharp waveform discontinuity can create a click at a cut. First try moving the boundary to a less obtrusive point and listening in context. A short fade can soften an edge but can also remove a consonant or drum attack. For a transition between sounds, a suitable overlap or crossfade may help when the editor and clips support it.

See how to fix clicks after cutting audio and how to fade audio in iMovie for separate checks. A fade at the outer edge does not automatically repair every internal cut.

Trim a separate audio file before iMovie

The Saturalabs audio trimmer can prepare a supported short local MP3 or WAV, preview the result and save a new file for import. It selects one continuous excerpt; it does not edit the iMovie timeline or preserve video sync automatically. Keep the original and align the prepared file against the picture.

Common questions

Does splitting audio remove it?

No. Splitting creates separate timeline sections. Select and remove the unwanted section if that is the intended edit, then check the remaining timing.

Can I cut the music without cutting the voice?

Only if music and voice are separate editable layers, or if you use a different source. A time cut in a mixed soundtrack affects everything in that interval.

Does detaching audio create an MP3?

No. Detaching creates an editable audio layer in the iMovie project. A standalone file requires an appropriate export or conversion workflow.

Why did my audio move out of sync?

A layer may have moved or an interval may have been deleted from one track. Compare the source in-point and a visible cue, and undo or reposition deliberately.