Key, BPM & chord finder

Drop a song to find its key, tempo and chords.

MP3 · WAV · M4A · FLAC · OGG · READ IN YOUR BROWSER

How to find the key, BPM and chords of a song

A key finder, a BPM finder and a chord finder in one. Drop a song and all three come back in a few seconds, worked out by your browser from the audio itself.

  1. Drop a song: An MP3, WAV, M4A, FLAC or OGG. It is read on this device; nothing is uploaded.
  2. Read the key and the tempo: The key with its relative major or minor and its Camelot code; the BPM, with the half- or double-time reading when the song can be counted both ways.
  3. Follow the chords: A chord for every bar, split in two where the harmony changes halfway, then every chord in the song, most played first.

What the finder reads

  • The key

    From the notes that sound most across the whole song, matched against the 24 major and minor keys. The next two candidates are shown with it, because when a key reading is wrong, the right key is usually the relative major or minor or a key a fifth away.

  • The tempo

    From where the song’s attacks fall: drums, strums, plucked and struck notes. Many songs can be counted at two speeds; when the other one is plausible, it is given too.

  • The time signature

    Four beats a bar, unless the harmony clearly repeats in threes, as a waltz does.

  • The chords

    Major and minor triads, dominant, major and minor sevenths, half-diminished and diminished sevenths, one per bar or half bar, spelled in the song’s key: G#m in E major, not Abm.

  • Its own tuning

    A recording tuned away from A = 440 Hz, such as a sample pitched down or an old tape, is measured first and read in its own key rather than between two.

  • Nothing leaves your computer

    Your browser decodes the file and the analysis runs on your device. No upload, no account, no limit.

Questions about the key and BPM finder?

We have answers.

How do I find the key of a song?

Drop the song on this page. The finder reads which notes sound most across the whole song and matches them to the 24 major and minor keys; the best match is the key, and the next two are shown below it.

How do I find the BPM of a song?

Drop it here. The finder tracks the beat from the song’s attacks and gives the tempo in beats per minute, with the half- or double-time reading when the song can be counted both ways.

Can it find the chords of a song from an MP3?

Yes. Any MP3, WAV, M4A, FLAC or OGG your browser can play: the chords come back bar by bar, spelled in the song’s key.

How accurate is it?

On a song with a clear beat and clear harmony, it is usually right. Key finders, this one included, most often confuse a key with its relative (C major and A minor share every note) or with a key a fifth away, so check the alternatives by ear. A tempo can read at half or double speed, so both are shown. The chart has one chord per bar or half bar, so quick passing chords are folded into their bar.

What is the Camelot code?

The key’s place on the Camelot wheel DJs use for harmonic mixing: 8B is C major and 8A is A minor, and keys one step apart on the wheel mix smoothly.

Is my song uploaded?

No. Your browser decodes the file and the analysis runs on your device. Nothing is sent, and there is no account or limit.

Can I get the notes, not just the chords?

Yes. Audio to MIDI transcribes a song into MIDI tracks, one per instrument, and audio to sheet music writes it out as a score.

From the chords to the parts

The finder tells you what is played. These give you the parts themselves.

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