How this song key finder works
Nothing to install, no account, and your audio never leaves your computer. The whole analysis happens inside your own browser.
- 1.Drop in an audio file: MP3, WAV, FLAC, M4A, AAC or OGG.
- 2.We measure how much of each of the twelve notes the track actually contains, then compare that fingerprint against every major and minor key.
- 3.You get the key, how confident the result is, the runner-up key when it is close, and the song's tempo as a bonus.
Why the answer is sometimes two keys
Every major key shares its exact notes with one minor key. C Major and A Minor use the same seven notes, and so do G Major and E Minor. These are called relative keys. What separates them is which note the music treats as home, and in a short or ambiguous passage that can genuinely be a toss-up.
When the two are close, we show the runner-up next to the main answer instead of hiding it. If you know how the song resolves, meaning which chord it settles on at the end of a phrase, you will know instantly which of the two is right.
What the confidence rating means
High confidence
One key fits clearly better than every other. You can take this at face value.
Medium confidence
One key leads, but a second is close behind. Check the alternative we show, especially if it is the relative major or minor.
Low confidence
Several keys fit almost equally well. Treat the answer as a starting point and confirm it by ear.
We also check the recording's tuning. Older records, tape transfers and some live recordings sit noticeably above or below standard pitch, and when that happens we say so. It explains why a song can sound like it is between two keys.
When key detection gets it wrong
Speech and noise
Podcasts, spoken word and field recordings have no stable harmony, so there is no key to find. You will get no answer rather than a made-up one.
Drums and percussion only
A drum loop carries almost no pitch information. The same goes for very heavily distorted or noise-based tracks.
Songs that change key
Plenty of songs lift into a new key for the last chorus. A single answer describes the section we analyzed, not the whole arrangement.
Clips under 15 seconds
We need a reasonable stretch of music to be confident. Very short clips are usually reported as unclear.
Who needs a song key finder
Singers
Find the original key, then move it up or down until the song sits comfortably in your range.
Guitarists and pianists
Knowing the key tells you which chords and scales to reach for before you play a note.
DJs
Harmonic mixing starts here. Tracks in the same or neighbouring keys blend without clashing.
Producers and remixers
Match a sample or acapella to your session before you build anything on top of it.
Song key finder: frequently asked questions
How do I find out what key a song is in?
Upload the audio file above. Within a few seconds you get the key, a confidence rating, and the runner-up key when the two are close.
Is this song key finder free?
Yes. It is free, there is no sign-up, and there is no limit on how many songs you check.
Is my music uploaded anywhere?
No. The analysis runs inside your own browser, so the audio never leaves your computer and we never store it.
Why does it show two keys?
Because a major key and its relative minor use identical notes. When the evidence does not clearly favour one, we show both rather than guessing.
How long does the clip need to be?
About 15 seconds or more. Shorter clips rarely contain enough harmony to name a key honestly.
Can I change the key once I know it?
Yes. Our pitch changer transposes a song up or down by semitones without changing how fast it plays.
Now you know the key
Move the song into a key that suits you, or find its tempo too.
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