BPM Detector
Find the tempo of any song online — free and instant.
100% in your browser — nothing is uploaded
BPM Detector
The BPM Detector estimates the tempo of any track in beats per minute, right in your browser. Drop in an audio file and the tool decodes it, measures the rhythmic pulse from the song's energy, and returns an estimated BPM in seconds — no upload, no account. Knowing a track's tempo is essential for a lot of everyday work: matching an AI-generated track to the pacing of a video edit, beatmatching two songs in a DJ set, layering a new part over an existing loop, or setting a metronome before you record. It is also the natural companion to key detection when you are organizing a library or planning a mix. Most online BPM tools make you upload your file to their servers; this one analyzes everything locally with the Web Audio API, so your audio stays private — which matters for unreleased material. The detector works by building an onset envelope from the track's energy and finding the most consistent beat interval through autocorrelation across a musical tempo range. Like every automatic tempo estimator, it is an estimate: very steady electronic tracks read most reliably, while rubato, half-time feels, or sparse arrangements can make a detector lock onto double or half the true tempo, so the tool also shows the common half- and double-time candidates. Use it as a fast, private first read, and trust your ears for the final call. It is free, needs no account, and works on desktop and mobile alike, so you can check a track's tempo wherever you happen to be working.
How to use it
- 1
Drop in a track
Add an audio file by dragging it in or browsing. It is decoded locally — nothing uploads.
- 2
Let it analyze
The tool measures the rhythmic pulse and estimates the tempo in a couple of seconds.
- 3
Read the BPM
See the estimated beats per minute, plus the common half- and double-time candidates.
- 4
Use it
Match the tempo to your video edit, DJ set, or metronome — or check it against the key finder.
Made for AI music creators
Matching an AI-generated track to a video or a DJ set? Detect its BPM here in seconds, then line it up with your edit — all privately, in your browser.
Frequently asked questions
How accurate is the BPM detector?
It is a solid estimate. Steady, beat-driven tracks read most reliably; sparse or rubato music can fool any automatic detector into half or double the true tempo, which is why we also show those candidates. Trust your ears for the final call.
Is my file uploaded to detect the BPM?
No. Analysis runs entirely in your browser with the Web Audio API, so your track never leaves your device — ideal for unreleased music.
What does BPM mean?
BPM stands for beats per minute — how many beats occur in one minute of music. It is the standard measure of tempo, used for beatmatching, editing to a grid, and setting a metronome.
Why does it show more than one tempo?
Automatic detectors can lock onto half or double the true tempo, especially in half-time or sparse music. Showing the common candidates lets you pick the one that matches what you hear.
What file types work?
Any format your browser can decode — MP3, WAV, M4A, OGG, FLAC, and more, up to 20 MB.