How it works
- Drop your audio file. MP3, WAV, FLAC, OGG or M4A up to 200 MB — it's decoded locally, nothing is uploaded.
- Let the analysis run. AudioKit scans the entire track in multiple segments and aggregates the key scores across the whole song.
- Read your key. The detected key is shown with its Camelot code, a tuning check against A = 440 Hz, the diatonic chords — and an honest alternative when the analysis hesitates.
Features
- 100% in your browser. Your track never leaves your computer — decoding and analysis run locally with the Web Audio API.
- Whole-track, multi-segment analysis. The song is split into about ten segments and the key scores are aggregated, so an intro riff or a breakdown can't dominate the result.
- Camelot code for DJs. Every result comes with its position on the Camelot wheel, ready for harmonic mixing.
- Tuning check & diatonic chords. The track's reference pitch is compared to A = 440 Hz (deviation shown in Hz and cents), and the diatonic chords of the key are one click away.
FAQ
Is this key finder free?
Yes. Anonymous users get 5 free analyses per day across AudioKit's free tools — no account needed. If you need more, AudioKit Premium removes the daily limit. There's no watermark and no feature lock: the free analysis is the full analysis.
Is my audio file uploaded to a server?
No. The detection runs entirely in your browser using the Web Audio API: your file is decoded and analyzed on your own machine and never leaves it. The only network call is a tiny anonymous counter that tracks your daily free quota.
Which audio formats are supported?
MP3, WAV, FLAC, OGG and M4A files up to 200 MB. That covers everything from a quick phone bounce to a full-length lossless master. If your file is in another format, run it through our free audio converter first.
How accurate is the key detection?
The analyzer scans the whole track in about ten segments and aggregates the scores, so one insistent riff or an atypical intro can't skew the result. Clearly tonal music is detected reliably, but statistical key analysis has intrinsic limits: when two candidate keys score close together, the tool says so and shows the runner-up — often the relative key — so you can listen and decide.
What is Camelot notation?
Camelot notation maps the 24 major and minor keys onto a clock-style wheel, numbered 1 to 12, with A for minor and B for major — 8A is A minor, 8B is C major. DJs use it for harmonic mixing: tracks whose codes match or sit one step apart on the wheel blend together without clashing. AudioKit shows the Camelot code right under the detected key.