Audio to MIDI Converter (Polyphonic, Free)
Drop a recording and get MIDI notes. The polyphonic AI mode finds chords on piano and guitar; the fast mode follows a single melody. Everything runs in your browser.
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When to use it
- Turn a piano or guitar recording into MIDI to edit in a DAW
- Capture a hummed, sung or whistled melody as notes
- Get a quick draft of chords and notes to transcribe a song
How to use
- Pick a mode: Polyphonic (AI, chords) or Fast monophonic (melody).
- Drop an audio file (the first 2 minutes are analyzed).
- Check the piano roll and press Play to hear the notes.
- Set the MIDI tempo and press Save MIDI (.mid).
Two modes
- Polyphonic (AI): Spotify’s Basic Pitch model (Apache-2.0) finds several notes at once. The first time, the model (about 0.9 MB) and runtime (about 1.3 MB) download from this site.
- Fast monophonic: follows one note at a time (singing, whistling, flute). It can’t handle chords.
Limits
- The result is a draft. Overtones can show up as extra notes an octave or a twelfth above, and drums or effects can add stray notes.
- Pitch bends are not exported.
- Nothing is uploaded; analysis happens on your device.
FAQ
Can it detect chords?
Yes. Polyphonic (AI) mode uses Spotify’s Basic Pitch model to find multiple notes at once, so it works for piano and guitar chords.
When should I use fast monophonic mode?
For a single melody such as singing, humming, whistling or a flute. It is quicker but can’t handle chords.
Is my file uploaded?
No. The model runs in your browser and the audio never leaves your device.
How long can the file be?
The first 2 minutes are analyzed. Split longer songs into parts.
How accurate is it?
Treat it as a draft. Overtones can appear as extra notes, and busy mixes add stray notes. Clean, solo recordings give the best results.
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