Song key finder: detect the key of any track
Drop a track and get its musical key and scale. Free, instant, fully in your browser.
Drop your track here
MP3, WAV, FLAC, AIFF, up to 50 MB. Analysed in your browser; nothing is uploaded.
The key of a song is the tonal centre everything resolves to, the note it feels 'at home' on, plus whether it leans major (brighter) or minor (darker). Knowing it lets you mix harmonically, pick a sample that won't clash, transpose to fit a vocal, or tell an AI generator exactly what tonality you want.
This finder reads the key for you. Drop in a track and it analyses the pitch content right in your browser, no upload, no sign-up, nothing stored. It's the same key detection that drives our reverse tool, offered on its own.
How key detection works
The tool builds a profile of which pitch classes are most present across the track, then matches that profile against the templates for every major and minor key. The closest match is the reported key and scale. Harmonically clear music reads reliably; very dense, atonal or heavily processed audio is harder.
Relative major and minor
Every major key shares its notes with a minor key (C major and A minor, for example). When a track sits between the two, detection can report the relative key. If the suggested key's notes are right but the mood feels off, check its relative major or minor.
Using the key for harmonic mixing
DJs and producers mix tracks in compatible keys to avoid clashes. Once you have the key here, neighbouring keys (and the relative major/minor) are your safest blends. For a fuller blueprint, tempo, mood and instrumentation alongside the key, run the track through the reverse tool.
Frequently asked questions
- Is my audio uploaded?
- No, detection runs entirely in your browser. The file isn't sent anywhere or saved.
- How accurate is the key detection?
- For harmonically clear music it's reliable. Atonal, very dense or heavily distorted tracks are ambiguous and may report the relative key.
- What's the difference between major and minor?
- They're the two common scales. Major tends to sound brighter or happier; minor tends to sound darker or more serious. The tool reports both the tonic note and the scale.
- Why might the key look wrong?
- Relative major/minor keys share the same notes, so detection can land on the relative key. If the notes fit but the feel doesn't, check the relative key.