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Free Online Key Finder — Detect the Musical Key & Scale of Any Song

SnipSound's key finder analyzes any audio file and tells you its musical key and scale (major or minor). It supports MP3, WAV, OGG, FLAC, AAC, and M4A. The full analysis runs locally in your browser using the Web Audio API and a chroma-vector matching algorithm based on Krumhansl-Schmuckler key profiles — nothing is uploaded anywhere.

How It Works

The detector extracts a chroma vector (the energy in each of the 12 pitch classes) from your audio, then compares it against reference profiles for all 24 keys (12 major + 12 minor). The best match becomes the detected key, and you see a confidence score plus the top three candidates so you can sanity-check the result. Songs that modulate or have heavy effects may return mixed results — the alternative candidates help in that case.

Why You Need a Key Finder

Common uses: matching the key of a backing track when adding vocals or a new instrument, harmonic mixing for DJ sets (Camelot Wheel / circle of fifths), finding songs that work in the same key as your project, transposing samples to fit a song, or learning a tune by ear once you know its key.