Convert audio to MIDI notes
Drop a melody, bass line or solo. ChordSonic's pipeline turns the audio into notes on a chromatic piano-roll — every pitch exactly where it was played — with a play-along playhead and a one-click MIDI download.
Free · no signup · daily limit applies
Upload your part
MP3 or WAV up to 50 MB — a melody, bass, lead or solo. The file stays private to your session and anonymous uploads are wiped within 24 hours.
Notes detected
ChordSonic's pipeline reads the pitch and timing of every note and lays them out on a chromatic grid — faithful to the audio, not snapped to a key.
Play along & export
Press play to watch the playhead track the audio across the note grid, then download a standard MIDI file to open in your DAW.
A note grid that's true to the audio.
Each detected note becomes a block on a chromatic piano-roll — its height is the pitch, its width is how long the note was held, and its colour comes from the note name. Because the grid spans every semitone, bends and out-of-key passages stay exactly where they belong.
Hit play and a moving playhead sweeps the grid in lockstep with the audio, so you can see and hear each note land together. When it looks right, download the MIDI and take it into your DAW or notation app.
Audio to MIDI FAQ
What does the audio to MIDI converter do?
It listens to your audio and works out which notes were played and when. You get a chromatic piano-roll — every note placed exactly where it sounds in the track — plus a MIDI file you can download and open in any DAW or notation app.
How do I convert audio to MIDI?
Upload an MP3 or WAV, wait a moment while ChordSonic's pipeline detects the notes, then press play to follow the moving playhead across the note grid. When you're happy, hit Download MIDI to save a standard .mid file.
What audio works best?
A single, clear part transcribes most accurately — a vocal melody, a bass line, a synth lead or an instrumental solo. Dense full mixes with many overlapping instruments are harder for any converter, so isolating a stem first gives the cleanest result.
Are the notes snapped to a key?
No. The note grid is fully chromatic and faithful to the audio — every detected note lands on its true pitch, not forced into a scale. That keeps bends, blue notes and out-of-key passages intact so the MIDI reflects what was actually played.
What can I do with the MIDI file?
Drop it into your DAW to re-voice the part with any instrument, quantise the timing, transpose it, or print it as sheet music. The download is a standard MIDI file, so it opens anywhere that reads .mid.
What audio formats can I upload?
MP3, WAV, M4A, MP4, FLAC and AIFF, up to 50 MB. Anonymous uploads stay private to your session and are wiped within 24 hours.
Want the chords behind the notes?
ChordSonic detects every chord change on the same kind of upload — key, tempo, and the full progression on a play-along timeline.
Analyze a track