Song Key FinderBeta

A free online song key finder — drop in a song or audio file and instantly detect its musical key, then hear the home chord to confirm it by ear. Works entirely in your browser.

Detects all 24 keys100% private — no upload
How to Use
  1. Drop in an audio file or click to choose one — MP3, WAV, M4A, OGG, or FLAC. It stays on your device and is never uploaded.
  2. Wait a moment while it analyzes the notes in the track and reports the most likely musical key, with a confidence rating.
  3. Press “Hear chord” to play the home (tonic) chord of the detected key as a reference tone.
  4. Play the song and listen with the chord in mind — if it sounds resolved and at rest, the key is right.
  5. If it feels off, tap one of the other likely keys (often the relative major/minor) and compare by ear.
  6. Copy the key, then use the Scale Visualizer, Chord Progression Generator, or Capo Calculator to play along in that key.
About this tool

About This Online Song Key Finder

Guitar Tool Hub's free song key finder (also called a key detector, key analyzer, or 'what key is this song in' tool) figures out the musical key of any song or audio file right in your browser. Drop in an MP3, WAV, M4A, OGG, or FLAC and it analyzes which of the 12 notes the music actually contains, then matches that fingerprint against all 24 major and minor keys to find the best fit — complete with a confidence rating and the most likely alternatives. Press play to hear the home chord and confirm the key by ear. Because all analysis happens locally on your device, nothing is ever uploaded — and it works best on pitched music with clear chords or melody.

  • 01Detects the key of any uploaded audio file
  • 02Scores all 24 major and minor keys
  • 03Works with MP3, WAV, M4A, OGG & FLAC
  • 04Confidence rating for each reading
  • 05Shows the relative major/minor and other likely keys
  • 06Visual note-content chart (chromagram)
  • 07Play the tonic chord to confirm the key by ear
  • 08Copy the detected key in one tap
  • 09Runs entirely on your device — files never leave your browser
  • 10Free — no account or install needed
Questions

Frequently Asked Questions

Related Tools
Key FinderDetect the key from a chord progression you type inBPM FinderFind the tempo of a song from an audio filePitch ChangerChange the key of a song without changing its tempoGuitar Scales VisualizerSee and hear the scale for the detected keyChord Progression GeneratorGenerate chords that fit the key you foundCapo CalculatorFind a capo position to play the song with easy shapes