Detect Song Key & Chord Progressions Online
Discover the harmonic structure of any track. Extracts 12-pitch chroma vectors to determine the root key and outputs a synchronized timeline of chords.
Upload your MP3 file
Drag & drop your file here, or click to browse (up to 25MB)
.MP3.WAV.MID.XML
Harmonic Key
C Major (Awaiting Audio)
Chroma Filterbank
24 Key Profiles Analyzed
Interactive Piano Roll (0 Notes)Click • Drag • Resize • Play
0 notes | BPM: 120
Click empty space to add notes • Drag to move • Drag right edge to resize • Press keys to auditionSelection: None
Ready to export your processed arrangement:
How to Use Key & Chord Finder
Complete Illustrated Guide →- Upload an audio recording or track.
- Click "Analyze Harmony" to compute spectral chromagrams and chord templates.
- View the primary key signature (e.g. A Minor, C Major) and confidence level.
- Follow the chord progression timeline in sync with audio playback.
- Copy the chord chart or export as MIDI.
Key Capabilities
- Krumhansl-Schmuckler 24-key harmonic correlation profiles
- Detection of Major, Minor, 7th, Maj7, Diminished, and Sus4 chords
- Timeline chord blocks with millisecond start times and durations
- Export detected chord progression directly to MIDI
Technical Specifications & Acoustic Limitations
Harmonic and scale calculations execute algorithmically using standard pitch-class profiling. Transposition and chord voicings follow common music theory conventions; verify enharmonic preferences (such as sharps versus flats) to match your score arrangement.
Frequently Asked Questions
How accurate is chord detection on complex acoustic music?↓
The engine reliably identifies primary triads and 7ths. In songs with heavy ambient reverb or non-standard tunings, small pitch ambiguities are displayed with confidence ratings.
Input & Output Formats
Supported Inputs:
MP3WAVOGG
Supported Outputs:
Detected Key & ModeTime-coded Chord ProgressionMIDI Progression
DAW Compatibility: Ableton, FL Studio, Logic Pro, Cubase, MuseScore, Sibelius.
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