Speed Up Video on iPhone: Built-In and App Options

Updated 5 November 2026 · Standard formula, shown below

You can speed up video on an iPhone with the built-in iMovie app, or record a time-lapse directly in the Camera app. For an existing clip, iMovie lets you choose a faster playback rate and save a new copy; the exact controls depend on whether the clip is ordinary video or a slow-motion recording.

Choose the right method

First decide whether you want to speed up footage you have already recorded or capture an event in time-lapse. These are different processes:

Existing video: Use iMovie or a compatible video-editing app to change playback speed. This is useful for making a long recording shorter or creating a fast-motion effect.
New time-lapse: Select Time-Lapse in Camera before recording. The iPhone captures and combines frames into a short video, so you do not need to adjust a finished clip afterward.
Slow-motion footage: Use the speed controls in Photos to choose which portion plays in slow motion. That built-in feature is designed to change the slow-motion section, not to speed up ordinary video.

For most people editing an existing clip, iMovie is a practical starting point because it is a free Apple editing app when available for the device. App availability and interface details can vary by iOS version; if you do not have it, check the App Store for a video editor with a playback-speed control.

Speed up an existing clip with iMovie

Open iMovie. If it is not installed, download it from the App Store if it is available for your iPhone.
Tap Start New Project, then choose Movie.
Select the video you want to edit in the media browser and tap Create Movie.
Tap the video clip in the timeline. The clip should become highlighted, and editing controls will appear.
Tap the Speed control, shown as a speedometer. Move the slider toward the rabbit to make the clip play faster. The displayed rate depends on the app version and the control’s available range.
Preview the result. Adjust the slider if the motion feels too abrupt or the finished clip is still too long.
Tap Done, then use the Share button and choose Save Video to export the edited movie to Photos.

Editing in a project generally leaves the original in Photos unchanged; saving the result creates an exported version. Keep the original until you have checked that the saved copy has the speed and sound you intended. If the timeline controls do not appear, make sure you selected the clip itself rather than the space between clips or the project background.

What changing playback speed does

A speed adjustment changes how quickly the recorded frames are played. At 2× speed, for example, a 60-second clip takes about 30 seconds to watch. At 4×, it takes about 15 seconds, assuming the entire clip is sped up uniformly. The recording’s duration shrinks, but the action also moves faster.

Speeding up video is not the same as increasing the frame rate or improving image quality. An editor plays the existing footage more quickly; it does not recover detail that was not recorded. Fast movement can look less smooth, especially when the source has relatively few frames per second. A modest speed increase often looks more natural than pushing a clip to the highest available rate.

Audio changes too. When video is accelerated, its sound may become shorter and higher-pitched, or an editor may handle the audio separately. If speech becomes difficult to understand, mute the clip, lower its volume, or add a separate music or narration track where the editor permits. Check the preview and exported file rather than assuming the audio will remain unchanged.

Use Time-Lapse for footage you have not recorded

For clouds moving across the sky, a busy scene, or a long setup process, Time-Lapse in Camera may be simpler than recording ordinary video and speeding it up later. Open Camera, choose Time-Lapse, frame the scene, and tap the record button. Tap it again when you are finished. The iPhone produces a time-lapse video automatically.

Time-lapse does not normally give you a setting for a precise final duration or playback multiplier. The resulting speed depends on how the phone captures frames over the recording period. If you need a particular length, record the time-lapse and then trim or edit the result. For a stationary shot, stabilize the phone on a firm surface or tripod and make sure it has enough battery and storage for the recording.

Speed controls for slow-motion recordings

Slow-motion clips are handled differently from ordinary videos. In Photos, open a slow-motion recording and tap Edit. The timeline includes controls marking the section that plays in slow motion. Moving those markers changes where the slow-motion effect begins and ends; it does not work like a general fast-forward slider for a standard clip.

If your goal is to make a slow-motion clip play faster than its current normal-speed portions, place it in a video editor such as iMovie and check which speed adjustments that editor allows for the selected footage. Save an edited copy and compare it with the original. Do not assume that changing the slow-motion markers will accelerate the entire recording.

Common problems and ways to avoid them

The speed control is missing: Select a video clip in the editing timeline. Some controls only appear after a clip is selected, and controls differ between apps.
The result is still too long: A small increase may not be enough. Estimate the target rate by dividing the original duration by the desired duration. For a 90-second clip that should last 30 seconds, the target is 3×.
The action looks choppy: Try a lower speed increase, or use a time-lapse recording for a scene that suits that format. Faster playback cannot create additional captured motion detail.
The sound is distracting: Preview the audio after changing speed. Mute it or replace it if the editor offers those options.
The export is hard to find: Use the editor’s save or export option and check Photos. Make sure the export has finished before closing the app.

Also leave free storage before exporting. Video files can be large, and an editor may need temporary space while rendering a new version. If export fails, close unused apps, check available iPhone storage in Settings, and try again. Menu labels may shift with software updates, so look for equivalent terms such as Share, Export, or Save Video.

Frequently Asked Questions

Can I speed up a video in the iPhone Photos app?
Photos has editing controls for slow-motion footage, including where its slow-motion section plays. For a general speed change to an ordinary video, use iMovie or another video editor with a speed control.

How do I make an iPhone video play at 2× speed?
Open the clip in iMovie, select it in the timeline, tap the Speed control, and adjust the slider until the displayed rate is 2× if that rate is available. Preview and export the result.

Does speeding up a video reduce its file size?
Not necessarily. A shorter video may use less storage, but the exported file size also depends on resolution, encoding, quality settings, and the editor’s export process. Check the saved copy rather than relying on duration alone.

Can I speed up only part of a video?
Many editors let you split a clip and adjust the speed of one segment. In iMovie, split the clip at the points where the change should start and end, then select the segment to adjust. Exact controls can vary by app version.

Is time-lapse the same as speeding up a normal video?
No. Time-Lapse records frames at intervals and assembles them into a fast-moving clip. Speeding up an existing video changes the playback rate of footage that was already recorded.

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