Sync videos and audio recordings by their sound: it tells you where each clip goes on the main video, to the hundredth of a second.
GoPro, phone or Tascam: add 2–6 files of the same moment and I'll tell you where each one goes.
GoPro chapters were joined by their file names.
Sync Audio & Video lines up several videos of the same moment, or a separate audio recording, by their sound: it tells you exactly where each clip goes on the main video (mm:ss.hh). No dragging waveforms by hand, nothing uploaded; it all runs in your browser.
Wind is different on every mic, but the engine, the road and a horn are heard by all of them. The tool looks at the timing of the sound rather than its loudness (GCC-PHAT), measures at 30 points of the recording and keeps the answer most of them agree on. It also measures the small speed difference between camera clocks and warns you on long clips. When it is not sure, it says "not found" instead of guessing.
Clap once or honk while all cameras are recording: the sync then lands to the frame in any conditions.
Are my videos uploaded?
No. The files never leave your device; the sound is read and matched in the browser.
Does it work with GoPro chapters (GX01, GX02)?
Yes. Parts of the same recording are recognised by their names and joined into one camera.
How accurate is it?
In our tests almost every matching clip landed within one frame (16.7 ms at 60 fps), most within 1 ms.
What if a video has no sound?
A silent video cannot be synced by sound; the tool tells you so.
The sound of my single video is out of sync — does this fix it?
This tool syncs several recordings to each other; it does not fix a delay inside one file.
Is it free?
Yes, free and no sign-up.
Developed by: otto.