Find Any Song's BPM and Key — Free Finder

Upload any song and instantly get its tempo (BPM), musical key, and Camelot code — everything DJs and producers need for harmonic mixing.

Two questions come up with every track a DJ, producer, or practicing musician touches: how fast is it and what key is it in? Tempo, measured in BPM, decides whether two songs can mix. Key decides whether they’ll sound good together. Get both wrong and the dancefloor empties. Get both right and transitions mix themselves.

The BPM & Key Finder reads any audio file in your browser and hands you both numbers, plus the Camelot code DJs use for harmonic mixing. No installs, no accounts, and your music never leaves your machine.

Open BPM & Key Finder →

BPM and key in plain English

BPM counts the beats in a minute. Lofi drifts around 75, house sits at 124, drum & bass screams along at 174. Tracks at matching, halved, or doubled tempos beat-match cleanly. Mismatched tempos clash, and no amount of key-matching fixes that.

Key is the song’s home base: A minor, F♯ major, that kind of thing. Same or neighboring keys blend; clashing keys sound wrong even when the tempos line up perfectly. The tool also reports the Camelot code (like 8A), which is just DJ shorthand for keys. Adjacent codes on the Camelot wheel share almost all their notes, so 8A flows into 9A or 8B without a trainwreck. Tempo and key, that’s the entire science behind every smooth transition you’ve ever heard.

Analyzing a track

Open the BPM & Key Finder and upload your file. MP3, WAV, whatever you’ve got.
Run it. The tool hunts for the pulse to get tempo, then builds a chromagram, a map of which pitches actually show up, to pin down the key.
Read the three numbers: BPM, key (say, A minor), and Camelot code (say, 8A).
Mix with the Camelot code. The same code mixes perfectly. One step away in either direction, or the A/B flip from 8A to 8B, is harmonically safe. That’s the whole Camelot wheel system, and it’s what DJ software worldwide is doing under the hood.

Putting the numbers to work

DJ sets: sort tracks by Camelot code and BPM band before the gig. Your transitions will practically mix themselves, and you’ll spend the night reading the room instead of doing music theory.
Mashups and remixes: check the acapella and the instrumental share a key, or sit a compatible fifth apart, before you burn a weekend arranging. Two minutes of checking saves hours of rework.
Practice: the key tells a guitarist which scale to solo in; the BPM sets the metronome. Instant practice session, no guessing.
Sampling: pitch the sample to your project’s key with the Pitch Shifter, exact semitone moves, no drift.

When to distrust the readout

Straight talk: this is analysis, not magic. On steady electronic, pop, hip-hop, and rock it’s excellent. On weird stuff, treat the result as a strong hint and let your ears make the final call.

Tempo changes. Prog rock, classical, anything with rubato, the tool reports one average BPM that might match no section of the song. Trust the metronome test over the number.
Sparse or atonal material. Ambient washes and atonal pieces give the key detector almost nothing to chew on. Expect it to waffle between relative major and minor.
The halftime trap. A 140 BPM trap beat reads as 70 BPM about half the time. Both answers are musically correct, DJs double or halve to taste. If the number feels wrong, try doubling it.

Tag your files or lose the data

A BPM reading you can’t find later is a BPM reading you never took. Build the habit:

Rename the file. Artist - Title [124BPM 8A].mp3 puts tempo and key in front of your eyes in any file browser or DJ software.
Use the comments tag. Rekordbox, Serato, VirtualDJ, they all have a comments field. "124 BPM / 8A" in there becomes searchable and sortable.
Sort by energy. Folders like "120–124 BPM / 8A–9A" for harmonic sets, or straight BPM bands for workouts and practice.
Re-check after edits. Time-stretch a track with the Tempo Changer and the BPM changes with it. Re-analyze or fix the tag, or future-you will be confused at midnight before a gig.

Ten minutes of tagging after each download session saves hours of guesswork later. An unfamiliar USB stick starts feeling like home.

Frequently asked questions

How accurate is the BPM detection?

Excellent on steady beats, usually within 1 BPM. The classic gotcha is halftime versus doubletime: 70 vs 140 is genuinely ambiguous, and humans argue about it too. If the number feels halved, double it in your tags and move on.

What is a Camelot code?

DJ shorthand for keys. Twelve numbers, each with an A (minor) or B (major) suffix, arranged on the Camelot wheel so neighbors share nearly all their notes. Mixing 8A into 9A sounds smooth without you touching a theory book. It’s the cheat code the whole industry uses.

Can it detect key changes within a song?

No. You get the single most likely overall key, which covers most pop and dance music, those songs stay put. A track that modulates halfway through gets the key of whichever section dominates. For the rest, your ears are the detector.

Does my music get uploaded anywhere?

Nothing leaves your machine. The analysis runs locally in your browser, no uploads, no servers, no copies floating around. Close the tab and it’s like it never happened.

What audio formats can I analyze?

Anything your browser can decode: MP3, WAV, OGG, M4A, the lot. The detector listens to musical content, not file containers, so compressed or lossless both work.