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Free · In-browser · No upload

Audio to MIDI & Voice to Instrument.

Turn a clean, one-note-at-a-time voice, hum, MP3 or WAV melody into editable notes. Set BPM, quantize timing, export a real .mid file or JSON, and preview it with a local instrument.

Before-and-after illustration of Audio to MIDI & Voice to Instrument: Hummed melody becomes MIDI instrument part through Detect and map notes.
Before → process → afterSee the signal story, then hear it in the workspace.

MUSICAL GRID MAP

Voice Note Mapper

Connect detected or generated events to a musical grid. Pitch, rhythm and harmony become useful only when event timing, confidence and editable musical labels stay visible together.

Before-and-after illustration of Audio to MIDI & Voice to Instrument: Hummed melody becomes MIDI instrument part through Detect and map notes.
Hummed melodyDetect and map notesMIDI instrument part
A musical-event view: source cues become timed notes or beats, then resolve into an editable pattern rather than a hidden one-click guess.
Open the full signal breakdownBest source, processing logic, limits and three-pass listening check
  1. Hummed melody

    Start with the right material

    Capturing a melody before it is forgotten, moving a clean single-note line into a DAW and testing it with procedural instrument timbres.

  2. Detect and map notes

    Understand the transformation

    Local pitch tracking segments the contour into notes; cleanup, BPM, quantization, velocity and duration controls shape the event list before Standard MIDI File export.

  3. MIDI instrument part

    Verify the usable result

    Editable notes, synthesized playback, a parsed .mid file for a DAW and a JSON note list with timing and pitch evidence.

Pitch confidence

Where this workflow stops

This is monophonic conventional DSP, not polyphonic AI transcription. Chords, accompaniment, noise, room echo and unstable pitch can create octave jumps, missing notes or ghost notes; the instrument previews are procedural approximations.

THREE-PASS CHECK

Make the final decision by ear

  • Confirm tempo, downbeat and key before trusting labels.
  • Review low-confidence events by ear and correct them manually.
  • Import the result into its target instrument or DAW before committing.

How to convert audio, voice or humming to MIDI

  1. Record a voice, hum or whistle, or choose a browser-decodable audio file such as MP3 or WAV. Use one note at a time without chords or backing music.
  2. Review the detected monophonic notes. Edit pitch, start time, note length and MIDI velocity; transpose or snap the melody to a major or minor key.
  3. Enter the MIDI BPM, choose a 1/4, 1/8, 1/16 or 1/32 grid, and apply minimum-note and short-gap cleanup.
  4. Download a real format-0 Standard MIDI File (.mid), a JSON note list, or the locally synthesized instrument preview as audio.

Honest scope: this is a monophonic pitch detector, not a polyphonic AI transcription service. Chords, drums, dense arrangements and full songs can produce missing notes, false notes or octave jumps. Piano, guitar and cello previews are procedural approximations, not sampled instruments. Selected audio stays in the browser; practical recording length depends on device resources and a safety limit is enforced.

Audio to MIDI & Voice to Instrument: quick answer and technical limits

Quick answer: A local monophonic audio-to-MIDI sketchpad that follows a clear hummed, sung, whistled or instrumental melody and turns it into editable note events.

Best for
Capturing a melody before it is forgotten, moving a clean single-note line into a DAW and testing it with procedural instrument timbres.
How it works
Local pitch tracking segments the contour into notes; cleanup, BPM, quantization, velocity and duration controls shape the event list before Standard MIDI File export.
What you get
Editable notes, synthesized playback, a parsed .mid file for a DAW and a JSON note list with timing and pitch evidence.

Know before you use it: This is monophonic conventional DSP, not polyphonic AI transcription. Chords, accompaniment, noise, room echo and unstable pitch can create octave jumps, missing notes or ghost notes; the instrument previews are procedural approximations.

Privacy: Selected audio is processed in this browser and is not uploaded to AudioWrench. Normal page assets can still be requested as described in the privacy notice. Privacy details →

FAQ

How do I convert audio or a voice recording to MIDI?
Load a browser-decodable recording with one clear note at a time. The tool detects a monophonic melody, lets you edit and quantize the note events, and exports a format-0 Standard MIDI File with tempo, note-on, note-off and velocity data.
Can this convert MP3 or WAV audio to MIDI?
Yes, when your browser can decode the selected MP3, WAV or other audio file. The output MIDI contains musical note events rather than audio. Use a clean solo voice, hum, whistle or instrument line for the most reliable result.
Can I edit the detected notes before exporting MIDI?
Yes. You can change pitch, start time, note length and MIDI velocity, delete false notes, transpose, snap to a key, set BPM, quantize from 1/4 to 1/32 notes, and apply minimum-note or short-gap cleanup.
Is audio uploaded, and can the tool convert chords?
Selected audio is processed locally in your browser and is not uploaded to AudioWrench. The detector is monophonic only: it does not separate chords, polyphonic instruments or full mixes, which can create wrong notes or octave jumps.