How to Speed Up a Video on iPhone

The fastest way to speed up a video on iPhone is to open the clip's inspector in iMovie, drag the Speed slider, and decide whether the voice's pitch should change along with it. Here's the full workflow, plus a shorter alternative for talking footage.

Speed up a video on iPhone with iMovie

Tap the clip to open its inspector, then tap Speed. Dragging the slider shows the ratio as you go. 2x plays twice as fast. Using Add with the yellow handles lets you apply speed to just a section of the clip instead of the whole thing. The Photos app editor has its own, simpler version of this: opening a clip's editor there now also surfaces playback speed options directly, without needing to bring the footage into iMovie first. Useful for a quick single change, though it doesn't offer the multiple speed sections iMovie does.

Speed ramps: fast on the setup, normal on the payoff

Multiple speed sections on one clip mean you can rush through the slow build-up and drop back to normal speed right where it matters. The setup for a trick shot sped up, the trick itself back at normal pace, for instance. That's the difference between a speed ramp and just speeding up the whole clip: the pacing changes are deliberate, not uniform. iMovie also preserves pitch by default when it changes speed, so a sped-up voice doesn't automatically sound squeaky, that only happens if you flip Project Settings > "Speed changes pitch" on purpose, which is really meant for effects rather than for footage where someone is talking.

A single speed change works fine for a whole clip of driving footage or a time-lapse-style shot. It's the mixed case , a slow setup and a payoff worth savoring at normal pace , where the multiple-section approach earns its keep, since a flat 2x over the whole clip would rush the part that was supposed to land.

A shorter video without touching the speed

Speeding up isn't the only way to shorten a clip, and for talking footage it's often not the best one. Pushing the playback rate up changes how natural the speech sounds. Montaj takes a different route: it detects and removes the silences between what's being said, so the video gets shorter without the pace of the voice changing at all. If the goal was really just a tighter video, that's usually the better fix. If you specifically need the footage itself to play faster, iMovie's Speed control is still the tool for the job.