Free online music tool
Online Music Key Detector
Analyze an uploaded track to estimate its major or minor key, relative key, compatible keys, and diatonic chords.
Key detection is an estimate. Songs with modulation or ambiguous harmony can produce different results across tools.
Audio processing runs locally in your browser unless the tool explicitly performs a music catalog search.
Simple workflow
How to use the Music Key Detector
Upload a track
Choose a clear musical section or complete song.
Run key analysis
The browser builds a chromagram and compares it with 24 major and minor tonal profiles.
Explore the result
Review the detected key, confidence estimate, relative key, compatible keys, and scale chords.
Why use it
A focused tool for a faster music workflow
Use music key detector without installing a full audio workstation or waiting for a remote processing queue.
Fast harmonic starting point
Get a likely key before arranging, remixing, or matching tracks.
Major and minor estimates
Frame-by-frame chroma analysis compares all 24 major and minor possibilities.
No cloud upload
Analysis runs locally on decoded audio.
Useful with other tools
Use the relative key, compatible keys, and diatonic chords when arranging or mixing.
Create something new
Need original music?
Use the detected key as creative direction for a new AI-generated song.
Questions and answers