DJs
Check song BPM and key for a whole crate before the gig, then mix by Camelot code so basslines never clash. A key and tempo finder that exports song BPM, key and Camelot code drops straight into a library spreadsheet.
Song Key Finder: Find the Key and BPM of Any Song
What key is this song in? Drop it on this free key finder and get the key, its Camelot code and the BPM in seconds, with no upload and no sign-up. Add many songs at once for a table you can copy or save as CSV, record a melody from the mic or open a .mid file, then check the answer by ear with a drone, chord or scale played over the track.
- Nothing Uploaded
- Free, No Sign-up
- Key, Camelot and BPM
- Batch + CSV Export
Free · runs in your browser
Drop songs or MIDI files to find their key
MP3 · WAV · M4A · FLAC · OGG · AAC · MIDImany at once, up to 200 MB each
Or drop one or many files anywhere on this card.U filesR recordD demo
Try a demo
Real recordings, analysed in your browser like your own files
Runs in your browser, nothing uploadedFree to convertNo sign-up to listen
Finds the best of the 24 major and minor keys from the first 10 minutes. Modal songs, relative major and minor pairs, and music that is mostly drums or speech are the hard cases: check the runners-up by ear.
What Key Is This Song In? How the Key Finder Listens
What is the key of a song, exactly? It is the home note and scale that the melody and chords keep returning to, such as A minor or Eb major. To detect a song's key, the page turns up to the first 10 minutes of the track into a chromagram: how much energy each of the 12 pitch classes, C to B, carries from about C2 to C7. Peaks that are most likely overtones of a lower note count for less, so a bright harmonic cannot tip a minor song toward major. That profile is compared with templates for all 24 major and minor keys (the Krumhansl-Kessler profiles from music psychology) and the closest match wins. The runner-ups are kept too, so every result shows a confidence level and the other likely keys instead of one bare name. Like any music key detector built this way, it measures which notes the music leans on. It never reads the title, the tags or a database, which is why it works on your own unreleased songs as well.
Find a Song's KeyWhy Two Tools Can Name Different Keys
No method is right about every song, and two apps can disagree about the same file. When that happens, the music itself is usually the reason, and knowing why is half of how to figure out the key of a song yourself:
- Relative keys. A minor and C major use the same seven notes, so a song that leans on both can read as either. The chord that feels like home decides it.
- Modes and blues. A Dorian groove or a twelve-bar blues bends the scale, and the result is the nearest plain major or minor key.
- Key changes. Songs over a minute are also read in 20-second windows, so a real modulation shows up as a new section. A lift of a few bars folds into the main key.
- Drums, speech and noise. With little pitched sound there is nothing to measure, so the result reads No clear key and shows only a best guess in small print.
- Odd tuning. A record that runs fast, or a band tuned a quarter tone flat, sits between two keys and can land on either.
Why Use This Free Key Finder Online
A song key and BPM finder with no queue, no account and no upload: the whole analysis runs on the page you are reading.
Results in seconds
Analysis starts the moment a file lands. The first result is on screen while the next song is still decoding, and a long batch never freezes the page.
Songs stay on your device
Audio is decoded and analysed inside your browser tab. Demos, stems and DJ promos are never sent to a server, so unreleased music is as safe as anything else.
A whole crate at once
Find BPM and key for dozens of files in one drop: this BPM key finder gives each one a row with its key, Camelot code, BPM and confidence, ready to copy or save as a CSV.
Confidence you can see
The key finder notes how sure it is and lists the runner-up keys, so a close call between a key and its relative minor is never hidden behind one label.
Check it by ear
Play the detected key as a drone, chord or scale over the song. If it clashes, play the next key in the list against the track instead. Thirty seconds of listening beats any algorithm.
Free, with no sign-up
No account, no credits and no watermark. The work happens on your own computer, so checking a thousand songs costs nothing extra.
How to Use the Key Finder in Four Steps
Here is how to find out what key a song is in with this tempo & key finder, BPM and Camelot code included. In our tests a 30-second clip took about half a second, and a batch works through the list one file at a time.
Drag one file or a batch onto the key finder. MP3, WAV, M4A, FLAC, OGG, AAC and the soundtrack of most videos work, up to 200 MB each. You can also record 5 to 60 seconds from the mic, open a .mid file or try one of the four demo recordings.
Each file is decoded to mono at 22.05 kHz, and up to the first 10 minutes go through the key and tempo analysis in a background thread. Nothing leaves your device.
The result card works as a BPM and key identifier: key and mode, Camelot and Open Key codes, the relative key, the key signature, the keys that mix with it and the tempo, with a confidence level and the runner-up keys.
Turn on the key guide (drone, chord or scale) to confirm the key, then copy the result, or export the whole table as a CSV when you analysed several files.
Step 1 · Drop your songs
Key and BPM Finder Features for DJs, Producers and Singers
A key name is only the start. These are the jobs the page handles before you close the tab.
A batch key & BPM detector with CSV export
Drop a stack of tracks into the key finder. Songs are analysed one at a time, so you find key, BPM and confidence for every file while the page stays responsive, and each row also carries the Camelot and Open Key codes and any key sections. Click a column title to sort, click a row to open its full result, then copy the table into a spreadsheet or export a CSV for a DJ library, a sample pack or a set list. A song BPM and key finder that handles the whole crate saves an evening of guesswork.
Analyse a BatchCamelot codes and keys that mix
Each key comes with its Camelot code and its Open Key code, so A minor reads 8A (1m) and C major reads 8B (1d). The card also lists the keys that mix with it: one step either way on the same ring, the relative key with the same number and the diagonal move. To explore every code and hear each key, open the Camelot wheel.
See the CodesCheck the key by ear with a drone
A detected key is a best guess, so test it. The key guide plays a drone, the tonic chord or the scale of the key in time with the track: if it sits comfortably, the key is right; if it rubs, press play next to the runner-up in the list of likely keys, listen again and choose Use to make it the result. The key finder sounds each choice for you, which is the quickest way to settle C major against A minor.
Hear the KeyKey & tempo finder in one pass
Run the key finder, BPM included: tempo comes from the same analysis, with half time and double time ready for tracks you feel at 87 or 174. As a key and BPM detector it lets you detect key and BPM without opening a second tool. For tempo-only jobs the BPM finder goes further, and tap tempo settles a beat by hand.
Get Key and BPMSing, play or open a .mid file
Wondering "what key am I in?" while you sing? Record a phrase of 5 to 60 seconds from the mic and it works as a vocal key finder. Anything with pitch goes into the key finder: piano, guitar, voice, synth, so it doubles as a guitar key finder or a piano key finder for a riff you are working out. Got a MIDI file instead? With a .mid it becomes a key finder from notes, reading the pitches directly instead of guessing from sound, and a key signature written in the file is shown beside the result.
Record or Open a FileA Real Result: Bach's Prelude in C, Exactly as Detected
Kimiko Ishizaka's public domain recording of the Prelude in C major, trimmed to 26 seconds. Below is exactly what the analysis returned in Microsoft Edge.
What you are looking at
C major, Camelot 8B, high confidence, at 111.4 BPM. The runner-up is A minor at 0.743, then E minor and G major: the relative minor first, exactly the close call described above, but with a clear gap this time. The chroma shows why: C, E and G carry the most weight, D and A come next, and C#, Eb, G# and Bb are the four quietest pitch classes. Pick the Bach card under Try a demo above: it shows the printed key, C major, marks the reading as a match, and the key guide and Camelot keys work on it.
How to Find the Key of a Song by Ear
No tool needed, just some listening. How do you find the key of a song this way? Start with the home note and work down the list. It also settles a close call when the detected key and the runner-up are near each other.
Hum the home note
The first trick for how to work out the key of a song: pause at the end of a phrase and hum the note that feels finished, like a full stop. That is usually the tonic. Find it on a keyboard, or sing it into the pitch detector to name it.
Listen to the last chord
Most songs end on the tonic chord, so if you learn one way how to tell the key of a song, learn this one. A settled final chord gives you the key note, and its colour, bright or dark, gives you major or minor.
Follow the bass
The bass lands on the key note at the start of sections and at the ends of phrases. The note it keeps returning to is how to tell what key a tune is in, even in a busy mix.
Decide major or minor
Sing up three notes from the tonic. A bright major third means major, a darker minor third means minor. This step is how to identify the key of a song when two candidates, like C major and A minor, share every note.
Test the scale, or the chords
Play the seven notes of the key you suspect along with the track: if all of them fit, that is how to find out the key of a song for certain. If one note clashes again and again, you may be one step away on the circle of fifths. Know the chords already? Find the key from chords by spotting the one every phrase resolves to.
Read the key signature
With sheet music, here is how to find key signature clues: count the sharps or flats at the start of the staff. One sharp means G major or E minor, one flat F major or D minor, and the last chord tells you which.
How Accurate Is a Key Finder? What to Expect
So far it has been checked on synthetic test tracks and the demo recordings, not on a large library of real songs, so we publish no accuracy percentage. This is how each kind of track tends to behave, and how to determine the key of a song when the answer looks wrong.
Clear harmony: usually solid
Pop, rock, folk and piano songs with clear chords in a plain major or minor key give the most confident results, often with a wide gap to the runner-up.
Relative keys: the classic mix-up
C major and A minor share every note. When the runner-up is the relative key and the confidence is medium or low, let the drone or the last chord decide.
Modal, blues and jazz: nearest key
Only major and minor keys are named. A Dorian or Mixolydian tune comes back as the closest of the 24, and busy jazz changes may not settle on one key at all.
Drums and key changes: check by ear
A drum loop has almost no pitch to measure and reads No clear key. Key changes are listed by section in songs over a minute, but a short lift folds into the main key, so trim it into its own file if you need to be sure.
Key Finder vs Finding the Key by Ear
Three honest answers to how to determine what key a song is in. Most musicians let software take the first pass and use their ears to confirm.
| This siteToMIDI key finder | By ear | Key signature | |
|---|---|---|---|
| Speed | Seconds per song, many at once | A minute or more per song | Instant, if you have the score |
| Skill needed | None | Some ear training | Reading music |
| Major or relative minor | Scores both and shows the runner-up | Decided by the home chord | Same signature for both; check the last chord |
| Modal music | Nearest major or minor key | Can name the mode | Signature plus the home note |
| Key changes | A key per section in songs over a minute | Hears every change | A new signature where it is written |
| Camelot code | Yes | Convert by hand | Convert by hand |
| Best for | DJ crates, sample packs, quick answers | Learning, jamming, settling close calls | Players reading from the page |
Who Uses a Song Key Finder
Anyone who has asked "what key is it in?" and needed the answer before the next song starts.
Producers and beatmakers
A beat key finder that also works on loops: find the key of a sample before you build on it, or find a beat's key before you write the bassline. Asking what key is this beat in? A ten-second beat key test answers it, and the drone gives you a reference to play over.
Singers
Learn the key of the song you are covering, then move it into your range with the song key changer. Sing into the key finder; voice memos work too.
Guitarists and pianists
Run the key finder, guitar in hand, and you know which scale to solo in and where to put the capo. After the key finder, chords are next: the result lists the seven chords in the key, and the chord finder names any chord you hear.
Teachers and students
A key finder for music classes and a song key identifier for ear-training homework: students learn how to know the key of a song by guessing first, then comparing with the result and the drone. It is a key detector music teachers can open on any school laptop.
Bands and worship teams
Use it as a quick key and BPM checker before rehearsal, plan smooth moves between songs and print parts in the right key with transpose sheet music.
Key Finder FAQ
Straight answers to the questions people ask about finding a song key.
What is the most accurate key finder?
No tool is right on every song, and none can be: relative keys, modes, key changes and songs with little harmony trip up every method that listens to audio. On a clear pop or rock song most good tools agree. The real difference is what happens on a close call. This one shows a confidence level and the runner-up keys and lets you test them by ear with a drone, so a wrong guess does not slip through.
Are key finders any good?
Yes, for most songs with clear chords in a major or minor key. They are weaker on modal tunes, blues, drum-heavy tracks and songs that change key, where they give the nearest of the 24 keys. Treat the result as a strong first answer, then confirm it by ear: that is how to find what key a song is in with confidence.
How do you know what key a song is in?
Find the note that feels like home, check whether the last chord is major or minor, and confirm by playing the scale over the song. Whether you ask how do I tell what key a song is in or how do you figure out the key of a song, that is the whole method. Or drop the file at the top of this page and let it do the first pass.
How can you tell what key a song is in without a tool?
Here is how to tell what key a song is in by ear: hum the home note, listen to the final chord, follow the bass and sing up three notes to tell major from minor. The by-ear steps above go through each one. If you have the sheet music, the key signature narrows it to two keys. That is how to know what key a song is in for most pop, rock and folk.
Is this key and BPM finder free, and are my songs uploaded?
The whole tempo and key finder is free, with no account, no credits and no limit on how many songs you check. Unlike a typical song key detector online, this online key finder decodes and analyses every file inside your browser tab, so the audio never leaves your device. No key finder program, key detector app or desktop BPM and key detector is needed either.
How do I know what key a song is in: A minor or C major?
They are relative keys with the same seven notes, so a song that leans on A and E chords can score as A minor even if it ends on C. Look at the runner-up, play both drones over the song and pick the one whose tonic chord feels like home. That is how to tell a song's key when two answers are this close.
How do I find the key of a song that changes key?
Drop the whole song. In tracks longer than a minute the page also reads 20-second windows every 5 seconds, so each section that settles in a new key is listed with its own key and approximate times, and the main key is the one the song holds longest. Modulations shorter than about 20 seconds fold into the surrounding key; trim those into their own file, or let your ears follow the change.
What is a Camelot code, and what key is 1A?
Camelot gives each of the 24 keys a number from 1 to 12 and a letter: A for minor, B for major. 1A is G# minor (also written Ab minor) and 1B is B major. Keys one number apart, or with the same number, mix smoothly. The Camelot wheel shows all of them.
Can I use it as a YouTube key finder?
Not with a link: there is no box for YouTube URLs. Use a copy of the song that you own, or play it on your speakers and record a few bars with the mic. A short clip of the chorus is enough to find a song's key.
Can I look up a famous song's key without the file?
Not here, because there is no song database. If you are asking what key and BPM is this song about a chart hit, drop in a copy you own or record the chorus from your speakers. The page analyses the sound, not the title, so you can find the key to any song you can play.
How do you determine the key of a song from just a vocal or a beat?
Drop the stem the same way. An a cappella works as long as it carries a melody, and a voice key finder reading a clean vocal is often more reliable than a full mix. As a key finder for beats it needs a loop with chords or a bassline, so you can find the key of a beat with a melody in it; a drum-only beat has no key to find and reads No clear key.
Do I need a key detector plugin or a key finder VST?
No key finder VST, free download or installer is required: it is a web page. Keep it open next to your project as a key detector FL Studio, Ableton or Logic users can drop files on, instead of loading a key finder plugin on every track.
What key are these notes in? Can I use a MIDI file?
Yes, open a .mid file and the page reads the notes themselves, weighted by length and loudness with drum tracks left out, which avoids the guesswork of audio. The tempo comes from the tempo map inside the file. There is no box for typing notes or chord names, so it is not a key finder from chords you type in; for a single chord, use the chord finder.
Is it an AI key finder?
No. It is a classic auto key finder: a chromagram matched against key profiles from music psychology. There is no neural network, no training data and no server, which is why every result comes with a confidence level and runner-ups you can check.
What audio formats can I use?
It is an MP3 key finder first and a WAV key finder too. This audio key finder also reads M4A, AAC, FLAC, OGG, Opus and the soundtrack of MP4, MOV and WEBM video, as far as your browser can decode them. Any clip of five seconds or more works, up to 200 MB per file.
What can I do with the key once I know it?
The result already lists the scale and the seven chords in the key. Move the song to another key with the song key changer, see its neighbours on the circle of fifths, or turn the melody into notes with our audio to MIDI converter and edit them in any DAW.
More Key and BPM Tools
Put the Song Key to Work
Name the chords, change the key, or turn the song into notes you can edit.
- Chord FinderName any chord from notes or audio.
- Pitch DetectorSing or play a note and see its name.
- Transpose Sheet MusicMove a score to any key or instrument.
- MP3 to MIDI ConverterConvert MP3 songs and stems to MIDI.
- Song to Piano NotesGet piano notes and sheet music for a song.
- Chord Progression GeneratorBuild progressions and export MIDI.
Try the Free Key Finder Now
Find the key of a song online in seconds: drop it at the top of this page for the key, the Camelot code and the BPM, free and private, with nothing uploaded.