How to Add a Voiceover to a Video on iPhone

The fastest way to add a voiceover to a video on iPhone is to park the playhead where the narration should start, tap Add Media then Voiceover in iMovie, and record after the 3-second countdown. Here's the full sequence, plus what to do with the narration once it's recorded.

Add a voiceover to a video on iPhone with iMovie

Scrub the timeline to the point where the narration should begin, tap Add Media, then Voiceover. The first time, iMovie will ask for microphone access. Tap Record, wait through the 3-second countdown, and tap Stop when you're finished. The recording is added as its own audio clip on the timeline, layered above whatever video and sound is already there, so it doesn't touch or overwrite the original clip's audio.

Recording a take you won't have to redo

The countdown isn't just a formality. It gives you a beat to settle before speaking, so the recording doesn't start mid-breath or clip your first word. What actually determines whether the take sounds usable happens before you hit record, though: a small room with soft furnishings absorbs echo far better than a bare one, and holding the phone closer to your mouth than feels natural does more for clarity than any setting in the app. If one line comes out wrong, you don't need to redo the whole voiceover: park the playhead at the start of that sentence and record a fresh take from there, and the earlier lines stay untouched.

Recording the whole voiceover in one continuous pass is usually a mistake for anything longer than a few sentences. The moment one word trips you up, the natural instinct is to start over from the beginning, which turns a 30-second narration into a dozen failed takes. Recording it in shorter sections, sentence by sentence or paragraph by paragraph, using exactly the re-record trick above, keeps a single stumble from costing you the whole recording.

Your narration, written on screen

Once you've recorded a voiceover, it's spoken audio like any other, which means it can become word-by-word subtitles automatically. Montaj transcribes it on your device and turns it into karaoke-style captions you can edit inline, so the same narration you recorded ends up written on screen too, with each word carrying its own timing rather than one caption block sitting on screen for the whole line. That matters because a real share of video gets watched with the sound off, on a train, in a meeting, in a feed that autoplays muted by default. Adding a voiceover to a video on iPhone is only half the job if nobody with the volume down can follow along.