Song key finder: what key is this song in?

This free song key finder reads what key a song is in: the scale and the Camelot code DJs mix by: in about two seconds, and it hands you the tempo in the same pass.

No account, nothing to install. This is also a key detector: upload once, get key, scale and Camelot code back.

By Sam Ridder · Last updated: September 2026

No account. No watermark. Free for files up to 120 MB.

A song key finder here means one upload: the key, scale and BPM come back together, free and in about two seconds. It runs in a phone browser too, so there's no key finder app to install on Android or iPhone; you get the same three answers as on a desktop. It also reads a short loop, not just a full song, as long as there's enough music in it to judge.

Key, scale and Camelot code

Every key sits on the Camelot wheel at a number-and-letter address: 8B, 11A, 6A. Two tracks mix cleanly when they share that address, or when one is one step around the wheel; go further than that and the clash gets audible fast. That's the whole system DJs lean on for harmonic mixing, and it's what comes back here alongside the plain key name.

Key and scale, C major, F♯ minor…
Camelot code, your mixing address: same number/letter, or one step either way, keeps two tracks compatible
BPM, alongside it, from the same upload
Nothing kept: your file is deleted the moment the result appears

How to find the key of a song

Drop the track in above: MP3, WAV, M4A, FLAC and video files all work.
Wait about two seconds.
Read the key and the Camelot code, then check what else sits at that address on the wheel if you're building a mix.

How reliable is key detection

Reliable on well-produced music with a clear tonal centre, and here is where it isn't:

Relative major and minor share the same notes, so C major and A minor are genuinely hard to separate. Good news for mixing: they share the same spot on the Camelot wheel either way.
A key change mid-song is reported as one key: whichever dominates.
Atonal, heavily processed or drum-only material has no key to find.
Speech and podcasts. There's no tonal centre to find in spoken word, so skip it for those.

On silence, or a clip too short to read, you get "couldn't read this" instead of a guess: showing nothing beats a confident wrong key.

Reading the key vs. changing it

This page only reads the key: drop the file in, find its scale and the Camelot code, then move on. If what you actually want is to shift the song into a different key, a semitone or two for an easier vocal range, or the whole track up, that's a different job, handled by the song key tool instead.

Producers use it as a key finder for beats before laying other instruments over the top, so a sample or a bass line lands in the same key as the track it's going into. If you're about to set up Auto-Tune or another pitch-correction plugin, this is the same reading an autotune key finder gives you, taken from the raw audio before any plugin touches it. As a music key finder it reads the key straight off the file you upload, not from a database of other people's guesses, so as a key checker or key identifier it works on your own unreleased tracks too, and as a key and scale finder it names the home note and the scale. To find a key without any music theory, that's all you need: it's a key finder music producers and singers can use without knowing a single chord.

Every track needs its own upload; there's no batch mode for a whole album or set list, and used as a key finder song by song, each file gets its own fresh reading. If all you want is to find the tempo of a song, the BPM finder puts that number first; to find tempo and key together, stay here. To find song tempo and key for a whole set, run the tracks through one at a time; each one takes about two seconds. With no account and no daily counter, that makes it a songs key finder you can run through a whole playlist, one upload at a time. You don't need to sign up for this free key finder: upload, read the key, done. It is a key finder for songs you own, so the key comes from your file, not from a title lookup. On a phone there is no music key finder app to install, because the page runs in the browser. A music key finder online is only worth using on unreleased tracks if the upload is deleted afterwards, and here it is deleted the moment the numbers come back.

How it works

Drop the song in. Use the box at the top of this page, or click it to pick a file. MP3, WAV, M4A, FLAC and MP4 video all work, up to 120 MB on the free tier. There is no account, no e-mail address and no daily counter.
Wait about two seconds. The track is read on our own machines in the Netherlands. Your upload is deleted the moment the numbers come back: nothing about this page is kept.
Read the three cards. The key with its scale (C major, F♯ minor), the Camelot code for that key (8B, 6A), and the tempo in BPM. All three come out of the one upload, so you never need a second tool for the tempo.

That's the whole find key of any song routine here, and it works the same for a key finder bpm reading: one upload, both numbers, no separate BPM tool to open afterward.

What the key and Camelot code mean

The key of a song is two things at once: the note the music keeps coming home to, and whether it leans bright or dark. "A minor" means the song settles on an A and uses the minor scale, the darker of the two. "C major" settles on a C and uses the major scale. That is the whole idea: a home note and a flavour. Everything else on this page is shorthand for those two facts.

The Camelot code writes the same thing as a number and a letter, so two songs can be compared at a glance. A minor is 8A; its bright twin C major is 8B. The number says where the key sits on a wheel of twelve, the letter says minor (A) or major (B). Twenty-four key names become twenty-four addresses you can sort, and that is all DJs ever wanted from it.

Why DJs care. Two songs whose codes match, or sit one number apart, sound like they belong together when one plays over the other. Codes far apart clash, and a room full of people hears it straight away. So a DJ reads 8A off the track that is playing, looks for 8A, 7A, 9A or 8B in the crate, and the next mix lands smoothly without guessing and without any theory.

What to do with it if you are not a DJ. A singer uses the key to see whether a song sits in their range, and moves it with the song key tool when it does not. A guitarist or pianist uses it to pick the scale to solo in, or where to put a capo. A producer uses it to check that a sample sits in the same key as the track it is going into. A choir leader uses it to pick a starting note. Same number, four different uses.

One thing the code is not: a quality judgement. A song in 8A is not better or worse than one in 3B. The wheel only tells you what fits next to what.

What the Camelot code is for

The Camelot wheel renames the 24 keys as 1-12 plus A (minor) or B (major), so "E♭ minor works with G♭ major" becomes "6A works with 6B": easier to read at a glance than key names. From any track's code, three moves stay safe: the same number and letter (identical key), one step clockwise or counter-clockwise (8B to 9B or 7B, a subtle lift or drop in energy), and the same number with the other letter (8B to 8A, its relative minor, a mood shift with no clash). Go further around the wheel than that and it starts to grate. Mixing your own edit? StemGrab gives you the acapella and instrumental from the same file, and key, BPM and stems together explains the full pass. Only after the tempo? The BPM finder is the same tool with the tempo up front. Want the whole song mapped out around that key instead of just the root note? MP3 to MIDI converts it into a file with vocals, bass, guitar and piano each on their own track.

Limits

What this song key finder does not do, so you know before you upload.

Size. Up to 120 MB per file on the free tier: easily a full-length MP3, or roughly ten minutes of uncompressed WAV. A €5 ShinobiTools pass takes 300 MB, and works on our other tools too. One track at a time per visitor, because each one only takes about two seconds anyway.
Formats. MP3, WAV, M4A, FLAC and MP4 video. A video file is fine: the soundtrack is read and the picture ignored.
Live recordings are hard. A phone recording of a gig, a rehearsal-room bounce or a crowd-heavy live album gives far less to work with than a studio master. The key that comes back is a weaker guess, and worth checking by ear.
An acapella on its own is hard too. A lone voice with no chords under it carries the melody but not the harmony, so the scale stays ambiguous: the same tune genuinely fits several keys. Feed in the full mix if you still have it.
Relative major and minor. C major and A minor use exactly the same notes, so any tool can land on the wrong one of the pair. On the Camelot wheel that pair shares a number (8B and 8A), which is why the code is often the more useful of the two answers.
One key per song. A track that changes key halfway is reported as whichever key dominates, not as two.
No chords and no sheet music. You get the key, the scale, the Camelot code and the BPM. Nothing else comes back from this page. As a key song finder it names the key of the file you upload; it does not search for songs by key or suggest tracks that match one.
Some files have nothing to read. Silence, a clip that is too short, drum-only material and spoken word have no tonal centre. Then you get "couldn't read this" instead of an invented answer: showing nothing beats a confident wrong key.

Sources

Key (music) - Wikipedia: A key classifies music around a major or minor scale
Relative key - Wikipedia: Relative major and minor keys share the same notes
Harmonic mixing - Wikipedia: Camelot wheel is used for harmonic mixing by DJs

Common questions

Is the key finder free?

Yes: no account, no e-mail, no cap. It runs on our own hardware, and as a tempo finder online it needs no sign-up either. The only ceiling is the file size: 120 MB free, 300 MB with a €5 pass.

How do I find the key of a song online?

Drop your file into the box above, MP3, WAV, M4A, FLAC or a video, and the key, scale and Camelot code appear in about two seconds. That's the whole answer to what key is this song in; no account needed. It works the same whether you want to find song key details for a set list or find key of song files you're covering.

Does it detect the BPM too?

Yes, in the same pass, so it doubles as a beats per minute finder and song tempo finder; as a beat finder it returns the tempo, and the key comes alongside. It's a tempo and key finder in one, so the key, scale, Camelot code and BPM come back together from a single upload; you never have to run the same track through two tools.

What is a Camelot code?

DJ shorthand for the key: a number 1-12 plus A for minor or B for major. Tracks with the same code, or one number apart, mix together harmonically, so every upload doubles as a Camelot key finder for DJs.

Can it be wrong about the key?

It can, mostly between a key and its relative major or minor, which share the same notes. On unclear audio it says so instead of guessing.

Which songs give an unreliable answer?

A live recording or a phone recording, a bare acapella with no chords under it, drum-only tracks and anything atonal or heavily processed. On material with nothing readable in it you get "couldn't read this" rather than a guess.

Does it work on an MP3, or do I convert the file first?

No converting needed for MP3 files: any common format works for a key finder MP3 upload. It works as an MP3 key finder, and WAV, M4A, FLAC and MP4 video read exactly the same way. A video's soundtrack is read and the picture ignored.

Does it show the chords?

No. Naming every chord is a different job; this page gives the key, the scale and the Camelot code of the song as a whole, and it isn't a note finder for every note played either. For the chords bar by bar, use the chord finder; for the actual notes, MP3 to MIDI writes the song out as separate instrument tracks.

Can I type in chords or notes instead of uploading?

No. It reads straight from the audio; there's no manual note or chord entry involved. Upload the recording and the answer comes back without knowing a single chord name first.

Do I need Auto-Tune or another plugin to find the key?

Not for this. Plugins such as Antares Auto-Tune have key detection built in because they need it to tune a voice, so if you already own one you can use that. If you don't, use this page as an auto tune key finder: run the track through here as a key finder autotune step, then set the plugin to the key it names. An Antares Autotune key finder workflow works the same way, and this page needs nothing installed.

Can I change the key after finding it?

Not on this page: it only reads. Find the key first, then the song key changer shifts the track into a range that suits your voice.

Is there a song key finder online that works on a phone?

Yes. Open this page in your phone's browser, upload the track and read the key, scale and Camelot code. There is no app to install.

Does the audio key finder work on video files?

Yes. A video file is fine: the soundtrack is read and the picture is ignored.

Is an online song key finder accurate enough for DJing?

It is reliable on well-produced music with a clear tonal centre. Relative major and minor are the usual mix-up, and they share a spot on the Camelot wheel, so mixing is rarely affected.

Is my upload stored?

No. The key finder deletes your upload the moment the numbers come back, so there is nothing left to keep. Use the stem splitter instead and those results sit on the server for 45 minutes, or 24 hours with any pass. Nothing is shared or used to train anything. See privacy.

Related tools

BPM finder, the same one-upload pass with the tempo up front instead of the key.
Song key and BPM finder, both numbers side by side, with the stems explained.
Song key tool, move a whole track up or down into a key you can actually sing.
Pitch changer, nudge the pitch in semitones without dragging the tempo along with it.
Chord finder, not just the key but every chord, bar by bar, lighting up as the song plays.
Tap along for BPM, tap along on your keyboard and read the BPM, with no upload at all.