BPM Detector & Key Finder
Upload any audio file to instantly detect the tempo (BPM) and musical key. Perfect for DJs, producers, and anyone working with music.
Drag & drop an audio file here
or click to browse. MP3, WAV, FLAC, OGG, AAC supported
Tempo
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BPM
Musical Key
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Key
Waveform
How it works
This BPM detector uses the Web Audio API to analyze your audio file entirely in your browser. Nothing is uploaded to any server. Your files stay private.
BPM detection works by analyzing the audio's energy peaks and onset patterns to find the most likely tempo. Key detection uses chroma feature analysis, examining the relative strength of each pitch class to determine the most likely major or minor key.
For best results, use tracks with a clear rhythmic pattern and at least 30 seconds of audio.
Send your tracks to the right people
Now that you know your track's BPM and key, use Promoly to send stunning promos directly to DJs, journalists, and tastemakers.