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How do I sync two videos by their audio?

In short

Line them up by a sound both of them recorded. In most editors you do it by eye: zoom in on the audio waveforms and slide one clip until the peaks match. Desktop editors like Premiere Pro and DaVinci Resolve can do it automatically. camrip does it automatically too, on your phone or in the browser.

What makes syncing possible

Both videos have to hear the same sound: the music from a speaker, a clap, your voice in the same room. If one clip only has your voice in headphones and the other has the music, there is nothing in common to line up.

Tip: clap once, sharply, after you press record on every camera. A clap is a spike in the waveform that is easy to spot.

By hand, in CapCut or any phone editor

1. Put the first video on the main track and the second as an overlay above it.
2. Zoom into the timeline until you can see the audio waveform of both clips.
3. Find the same moment in both — the clap, the first beat — and slide the overlay until the spikes line up.
4. Play it back with both sounds on. If you hear an echo, they are not lined up yet; nudge frame by frame until it disappears.
5. Mute one of the two, and cut between them where you want the angle to change.

It works, but it is fiddly: a single frame off is enough to make lip-sync look wrong.

Automatically, on a computer

• Premiere Pro: select the clips and choose Synchronize with the audio option, or create a multi-camera source sequence synced by audio.
• DaVinci Resolve: create a multicam clip from the selected clips with the angle sync set to sound.

After syncing you still cut the angles yourself.

Automatically, sync and cut

camrip syncs up to four videos by their sound to the millisecond — no clap needed, the cameras can start at different times — and then also does the cutting: the best shot for every cut, on the beat for music or in the pauses for talking. The result is one vertical video, and every cut stays editable.

Sync and cut your videos