Are my audio files uploaded?
No. Decoding and analysis run locally in your browser, on your device.
About & help
Örbital Tools
Free Key & BPM Detector for Audio Files
Find the tempo and musical key of a track directly in your browser. The detector analyzes the audio on your device and returns an estimated BPM, major or minor key, and a confidence score without uploading your music.
What it does
- Estimates tempo in beats per minute and identifies a likely major or minor key.
- Displays a confidence score to help you judge ambiguous results.
- Lets you copy the result for use in your DAW, library, or session notes.
- Processes the track locally so the audio never leaves your device.
How to use it
- Choose a track. Drop an MP3 or WAV file onto the detector, or use the file picker.
- Wait for analysis. The browser decodes the audio and examines its rhythmic and tonal profile.
- Use the result. Copy the estimated BPM and key into your production, DJ, or cataloguing workflow.
Supported input
- MP3 audio files.
- WAV audio files.
- Up to the first 150 seconds of a track are used for analysis.
Good to know
- The result is an estimate; live recordings and tracks with tempo or key changes can be less clear.
- Half-time and double-time interpretations can both be musically valid.
- No account is required and the audio is not sent to an Örbital server.
Frequently asked questions
Why can another detector show a different BPM?
Some rhythms can reasonably be interpreted at half or double tempo, and detection methods weigh transients differently.
Can it detect key changes?
The result describes the strongest overall tonal center. A track with modulation may need section-by-section listening.
What should I do with a low confidence score?
Treat the result as a starting point and confirm it by ear or against an instrument in your DAW.