BPM & Key Detection
Detect BPM & Musical Key
Upload any audio file to instantly detect its tempo and musical key — entirely in your browser, no upload to any server.
Drop an audio file here to begin
Supports MP3, WAV, FLAC, AAC, OGG and M4A
100% Private
Your audio never leaves your device. Analysis runs entirely in your browser using the Web Audio API.
Instant Analysis
BPM detection and key analysis complete in seconds using on-device signal processing.
No Upload Required
Works completely offline after the page loads. No server, no account, no file upload needed.
Built for Musicians & Producers
Whether you need to match tempos for a DJ set or identify the key before sampling, get instant answers with no sign-up required.
- Krumhansl-Schmuckler key detection algorithm
- BPM analysis via bpm-detective
- Supports MP3 · WAV · FLAC · AAC · OGG · M4A