Audio BPM & Key Detector
Upload an audio file; this page estimates BPM and key in your browser. No upload/servers needed.
⬆️ Drop audio here or click to choose
MP3, WAV, AAC/M4A, AIFF, etc. We analyze up to ~90 seconds for speed.
File
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Length
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Sample Rate
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BPM
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Tempo Confidence
Key
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Key Confidence
Tip: If the BPM looks doubled or halved, tap the note—common with half-time/double-time grooves.
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Tips keep the free generators online—thanks! 🙌
Preset amounts open your app with the value pre-filled (when supported).