Speed Up Video in iMovie on iPhone, iPad, or Mac

Updated 5 November 2026 · Standard formula, shown below

To speed up a video in iMovie, select the clip in your project, open the speed controls, and choose a faster rate or drag the speed slider toward Fast. The steps differ slightly between iPhone or iPad and Mac, but the result is the same: the selected footage plays faster and takes less time on the timeline.

How to Speed Up a Clip on iPhone or iPad

In the iMovie app for iPhone or iPad, open your movie project and select the video clip in the timeline. The clip becomes highlighted and its editing controls appear. If you are starting a project, add the video to a new movie first.

Tap the clip in the timeline.
Tap the speedometer-shaped Speed button in the editing controls.
Drag the speed slider to the right, toward Fast. The displayed rate changes as you move it.
Preview the clip, adjust the rate if needed, then tap outside the controls to finish.

The slider changes the speed of the selected clip, not automatically every clip in the project. Repeat the process for other clips you want to accelerate. If the clip has audio, speeding it up also makes its sound play faster, which raises its pitch; you can mute or detach the audio if that is not the effect you want.

How to Speed Up a Clip on Mac

On a Mac, open the project in iMovie and select the clip in the timeline. Use the speed controls above the viewer to choose a faster playback option or enter a custom rate when that control is available.

Select the clip you want to change in the timeline.
Click the Speed button above the viewer. It is represented by a speedometer.
Choose Fast from the speed menu, then select a multiplier, or choose a custom speed if offered.
Play the clip in the viewer and make any timing adjustments.

Depending on the selected clip and iMovie version, the available controls can vary. If you cannot see the speed button, confirm that a video clip—not a title, transition, or audio-only item—is selected. Widen the iMovie window if its toolbar controls are hidden.

What the Speed Setting Changes

A speed multiplier describes how quickly the clip plays compared with its original rate. At 2× speed, a 20-second section plays in about 10 seconds; at 4×, it plays in about 5 seconds. The footage itself is not shortened by deleting frames from your source file: iMovie changes how quickly the selected material is played in the project.

Increasing speed also shortens that clip’s duration on the timeline. That can move later clips earlier and change the timing of titles, music, voice-over, and transitions. Review nearby edits after changing a clip, especially if other elements are positioned to match a particular moment.

Use a moderate speed-up to tighten a slow action while keeping it understandable.
Use a stronger speed-up for repetitive actions such as setup, travel, or a long process.
Use a short section when only part of a shot needs acceleration; split the clip around that section and change its speed separately.

Speed Up Only Part of a Video

To accelerate just one portion, split the clip at the beginning and end of the section you want to change. On iPhone or iPad, select the clip and move the playhead to a cut point, then use the clip’s split command in the editing controls. On Mac, position the playhead at the cut and use the split command from the Modify menu or its keyboard shortcut. The exact interface can differ by version.

After making two cuts, select only the middle segment and apply the speed setting. The sections before and after it remain at their existing rates. Check the joins in playback: a sudden change in pace may be intentional, but a brief transition or a different cut point can make it feel smoother.

Audio, Slow Motion, and Common Problems

Faster video usually means faster audio as well. This can make dialogue difficult to understand and raise music or ambient sound in pitch. To keep the original sound separate from the video’s new timing, detach the audio where the version of iMovie provides that option, or mute the clip and add a separate audio track. Listen to the result rather than assuming the picture and sound will remain natural.

If an action-camera or phone clip was recorded at a high frame rate, speeding it up does not create extra visual detail; it simply plays the footage faster. Conversely, a clip recorded at a normal frame rate may look less smooth at a very high playback rate, depending on the motion and the frames available.

The speed control is missing: Select a video clip in the timeline and check that you are not selecting a title, transition, or background.
The whole project is not faster: Speed is generally applied to selected clips. Repeat it on the other footage, or use a dedicated project-level workflow if your version provides one.
The edit changes music or titles: Preview the full timeline after a speed change and reposition elements whose timing no longer fits.
The clip looks jerky: Try a less extreme speed, use a shorter sped-up segment, and review the footage at full playback rather than judging only the timeline thumbnail.

Saving and Sharing the Faster Video

Changing a clip’s speed edits the iMovie project; it does not by itself create a separate finished movie file. When the edit is ready, use the project’s share or export controls to save or send the movie. Preview the exported result, because the final playback includes the speed changes and any audio edits you made.

If you want to preserve the original, keep the source video and avoid replacing or deleting it when sharing. The project records your edit decisions, while an exported movie is a rendered version intended for playback. If you later want a different speed, reopen the project and adjust the clip before exporting again.

Frequently Asked Questions

Can I speed up only one part of a clip in iMovie?
Yes. Split the clip at the start and end of that part, select the resulting middle segment, and change its speed. The other segments can stay at normal speed.

How do I make a video play at 2× speed?
Select the clip, open Speed, and choose or set a 2× rate if it is available in your version. A segment that originally lasts 30 seconds will then play in about 15 seconds.

Why does the audio sound high-pitched after speeding up a clip?
The sound is playing faster along with the picture, which raises its pitch. Mute or separate the clip audio and add audio at a suitable speed if you need a different sound.

Can I speed up all clips in an iMovie project at once?
Do not assume that changing one clip affects the others. Speed controls usually apply to the selected clip or segment, so check your timeline and adjust each clip that needs the change.

Does speeding up a video reduce its quality?
It changes playback timing, not the original recording. However, rapid motion can look less smooth, and the final exported movie’s quality also depends on the export settings and source footage.

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.