Glowtrack Studio BPM & Key Finder

BPM & Key Finder

Find the tempo, musical key, Camelot code and loudness of any song — free, right in your browser. Drop in several tracks at once. Your files are analysed on your own device and never uploaded.

Drop songs here, or click to choose MP3, WAV, FLAC, M4A, AAC or OGG · several at once is fine
Songs can feel like half or double their tempo — pick a range to steer the result.
No file? Tap the tempoTap the button (or press T) along with the beat — 8 taps or more gives a solid reading.
— BPM
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How it works

  1. Drop in your tracksAny common audio format. Add one song or a whole folder's worth — they're analysed one after another.
  2. Read the resultsTempo in BPM, the musical key with its Camelot code and the keys it mixes with, plus loudness in LUFS and true peak.
  3. Check by earPress play with the click track on to hear the beat grid over your song. Use ×2 or ½ if the tempo should be doubled or halved.

What the results mean

BPM (tempo)Beats per minute. Most pop and house sits around 100–130, hip-hop 80–100, drum & bass around 170. A half-time track can read as half its tempo — that's what the ×2 button is for.
KeyThe tonal centre of the song, such as A minor. Every minor key has a relative major with the same notes (A minor ↔ C major), so the two are easy to mix up; both are shown.
Camelot codeDJs use the Camelot wheel (8A, 9B…) for harmonic mixing. Tracks with the same code, one step either side, or the same number with the other letter blend smoothly.
Loudness (LUFS)Integrated loudness as streaming services measure it (EBU R128). Spotify and YouTube play music at about −14 LUFS, so louder masters are turned down.

FAQ

How accurate is it?

For songs with a steady beat, the tempo is usually exact to within a tenth of a BPM. Key detection is right for most songs, but no automatic method is perfect — songs that change key, or sit between a minor key and its relative major, can go either way. Play with the click track on, and trust your ears.

Why does it say 87 when my track is 174 BPM?

Many songs feel the same at half or double the tempo, especially drum & bass, trap and dubstep. Press ×2 (or ½), or choose a tempo range that fits the genre before adding the file.

Are my songs uploaded?

No. Everything is analysed inside your browser on your own computer or phone. Your audio is never sent anywhere, so it's safe for unreleased music.

What is the Camelot wheel?

A chart that numbers the 24 musical keys 1–12, with A for minor and B for major, so DJs can mix harmonically without music theory. Neighbouring numbers and the same number in the other letter are compatible.

What loudness should I master to?

Streaming services normalise to roughly −14 LUFS, so mastering much louder than that only gets turned down. Many engineers aim for −14 to −9 LUFS depending on genre, with a true peak no higher than −1 dBTP to avoid distortion after conversion to MP3 or AAC.

Which file types work?

Anything your browser can play: MP3, WAV, FLAC, M4A/AAC and OGG work in Chrome, Edge and Firefox; Safari handles MP3, WAV, AAC and FLAC. Up to the first 10 minutes of each file is analysed.

Is it free?

Yes — free with no sign-up, supported by the ads on the page.

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