Key and BPM finder
Find the tempo and musical key of your audio. Free, private, and ready to copy.
Drop your audio here
MP3 or WAV · Up to 40 MB and 10 minutes · One file at a time
Reading your audio
Preparing the file
Longer files take more time. You can cancel at any point.
Tempo
Algorithm candidate
Key candidate
Check against your audio
Camelot
From the selected key
Tap tempo
Tap along with the beat at least four times. Keep tapping to refine the tempo.
No audio file needed. Tap a beat or use Space while the tap button is focused. Open the standalone tap tempo tool.
Correction history 0
Changes are saved in this browser. Save correction also submits feedback. For other changes, choose Submit feedback to share the audio identifier, detected and corrected values, analysis version, time, and your note. Your audio and filename are not sent. Submitted feedback is awaiting review, not a verified answer.
Clearing browser data removes local history. Export it to keep a copy. JSON exports include the filenames saved on this device.
How to use the key and BPM finder
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Choose a file
Open a track, sample, or loop on your device. Use at least 4 seconds of MP3 or WAV audio.
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Check the candidates
Listen to your audio and check the tempo and key. Half or double the beat may fit your project better.
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Copy into your workflow
Copy BPM, musical key, or Camelot separately. Correct a result before bringing it into your music software.
Understanding your key and tempo results
BPM sets the pace
BPM means beats per minute. A 120 BPM pulse has one beat every half second. Use the estimate as a starting point for your project tempo, then listen for whether the beat stays aligned. Changing the result here does not stretch or edit your file.
If you can hear the beat but have no file to analyze, use tap tempo to measure BPM by hand.
Key describes the tonal center
The key candidate suggests a note and a major or minor scale. Check it against the pitched parts of your audio or a known reference in your project. Camelot gives the same selected key in a shorter notation; it is not a second detection result.
For example, a result of 120 BPM · A minor · 8A describes a tempo of 120 BPM and an A minor key candidate. “Tentative” means another key also fits; “Unclear” means there is too little consistent evidence to name one.
Why might tempo be half or double?
The same rhythm can be counted at different levels: 70 and 140 BPM can describe the same beat pattern. A tempo and key finder estimates one pulse. Listen, then choose the one that matches your session. Audio playback speed stays unchanged.
What if the key is unclear?
Drums, noise, single notes, changing keys, and some modes do not support one clear major or minor key. The tool can leave key and Camelot blank. Even a named key is an estimate, not a guarantee or an accuracy score. Relative major and minor keys can be especially hard to distinguish.
What happens to my audio?
Audio is decoded and analyzed locally. Your audio and filename are never uploaded by this tool. Corrections are saved in this browser until you delete them or clear browser data. Choosing Save correction or Submit feedback sends the audio identifier, detected and corrected values, analysis version, time, and your note to the feedback server. Do not include personal information in a note. Deleting a local copy does not delete feedback already submitted. There are no third-party analytics, advertising scripts, or tracking cookies. Clearing a result releases its audio from this page; it preserves correction history. Normal requests to load the website still occur. Read the full privacy notice.
What does the Camelot code mean?
Camelot is another notation for the selected musical key. Numbers run from 1 to 12; A indicates minor and B indicates major. A minor is 8A, and C major is 8B. If you correct the key, its code updates automatically.
Which files and recordings work best?
Choose a mono or stereo MP3 or WAV, up to 40 MB and 10 minutes. For files over 90 seconds, the tool samples 30-second sections from the beginning, middle, and end. Clear pitched music and steady rhythms provide the best evidence. Speech, live tempo changes, long silent intros, heavy distortion, and unusual tunings can give unclear or misleading candidates. There is no YouTube, Spotify, or link import.