onemaker.io

What key is this song in?

AI reads the musical key of any track in seconds. Free, no signup.

Drop a song and the AI tells you its key — C major, A minor, whatever it is — with how confident it is, plus the tempo as a bonus. Find the key to sing a cover in, pick songs that mix in key for a DJ set, or match a remix to the original.

How it works

a few seconds

  1. Drop your song

    Any of the formats listed, up to 200 MB. It uploads straight from your browser.

  2. The AI listens

    A minute from the middle of the song is enough to read its key. A video works too — we take its audio.

  3. Read the key

    The key with its confidence, and the BPM beside it. Then pick a template — the beat lines up.

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Questions

How does the song key finder work?
The AI listens to a minute from the middle of your track — enough to hear which notes the song keeps returning to — and names the key it is surest of, with its confidence.
Is it free?
Yes — no signup, up to 20 songs an hour. The hourly count and the 200 MB limit exist to stop abuse, not to sell you a plan.
What if no key is found?
Drums, speech and noisy recordings have no clear tonal centre. You still get the tempo; the key card says so honestly.
Does it give the BPM too?
Yes — the tempo comes with the key, along with the likely alternative (a beat can be counted at half or double speed).
What happens to my song?
Your upload is deleted the moment the analysis finishes. Nothing is kept — the answer is on this page only.
Try it free
Song Key Finder: What Key Is My Song In? · Onemaker