Detect the BPM of a video’s soundtrack

How it works

Browsers can decode the audio track of most videos directly, so there is no need to extract it first. Open an MP4, MOV, M4V or WebM file and the soundtrack is decoded and analysed just like an audio file; the picture is ignored. Very large videos take longer to read, because the whole file has to be loaded into memory.

For video editors, the beat grid is the useful output: the first-beat time and the beat length in milliseconds let you set markers in Premiere Pro, Final Cut, DaVinci Resolve or CapCut so cuts land on the beat. At 30 fps one frame is 33.3 ms, so a 120 BPM beat (500 ms) is exactly 15 frames.

Dialogue and sound effects over the music lower the confidence. If the result looks wrong, use Zoom on the waveform to find a section where the music is clear, listen to the click grid, and nudge it by 10 ms if needed.

Tips

• Beat length in frames = beat ms ÷ (1000 ÷ fps)
• Clear music sections give the best reading
• Nudge the grid to line up with your edit

Step by step

1. Open your audio. Click Open files or drop one or more MP3, WAV, M4A, OGG, FLAC or video files onto the page. They are decoded in your browser and never uploaded.
2. Read the tempo. The BPM appears with a confidence score and the top candidates. Use ½× or 2× if the result is half or double what you hear, or set a tempo range.
3. Check the beat grid. Click anywhere on the waveform to play from there with a click on every beat. Nudge the grid by 10 ms if it is slightly early or late.
4. Export. For several files, download the results table as CSV or TXT, or copy it to the clipboard.

FAQ