BPM Detector — Find the Tempo of Any Audio
Upload an audio file and instantly detect its beats-per-minute (BPM) tempo. Perfect for DJs, producers, and musicians looking to find the key of a track. 100% client-side — nothing leaves your browser.
How to Use the BPM Detector
- Upload audio — click the upload area or drag an audio file onto it.
- Detect — click Detect BPM. The audio is analyzed entirely in your browser.
- Review — see the detected tempo, beat count, and confidence score.
- Compare — check the tempo candidates chart for alternate interpretations.
Why Use This BPM Detector
Finding a track's tempo normally requires dedicated DJ software or desktop apps. This tool uses onset detection and autocorrelation analysis entirely in your browser via the Web Audio API. No uploads, no waiting, and your audio never leaves your device.
Tempo detection works best on rhythmic tracks with a clear beat — electronic music, hip-hop, rock, and pop all work well. Sparse or ambient recordings with no steady pulse may produce a less confident result.
Frequently Asked Questions
Any format your browser can decode — MP3, WAV, OGG, M4A, AAC, and WebM audio. The analysis runs locally, so your file is never uploaded.
BPM (beats per minute) measures the tempo of a track — how many beats occur in one minute. It ranges from very slow (below 60) through moderate (90–120) to very fast (160+), and is the standard way musicians and DJs describe musical speed.
The detector uses onset-energy analysis combined with autocorrelation across multiple time scales. For rhythmic tracks with a clear beat it is highly accurate. Some tracks use a half-time or double-time feel — the candidates chart shows these alternates so you can judge which interpretation fits.
Yes. Pair this tool with the MP3 to MIDI Converter to transcribe the melodic content of your audio into editable MIDI notes.
Use Cases
DJ Preparation
Quickly identify the tempo of tracks to build beat-matched playlists and mixes.
Music Production
Match the tempo of samples and loops to your project before importing them.
Fitness Workouts
Find the BPM of workout tracks to match your target training cadence.
Music Theory
Study the tempo of songs in your collection to understand genre conventions.