M4A to MIDI Converter

How to convert M4A to MIDI

1. Pick the sound. Choose Vocals / humming, Piano / keys, Guitar, Bass or Full song. Match the preset to the part in your recording.
2. Add an M4A file. Select or drop a recording up to 10 minutes long. Your browser must be able to decode its audio codec.
3. Convert and listen. Press Convert to MIDI. Watch the piano roll and compare Audio with MIDI playback.
4. Adjust and download. Refine the note settings and download the .mid file for your DAW or notation software.

The converter is free and needs no sign-up. It decodes and analyzes the audio in your browser, so the recording is not uploaded for MIDI conversion. The output is a set of musical notes, not a copy of the original sound.

Turn a voice memo into a melody

M4A is a common format for phone recordings. A hummed idea or a sung melody can make a useful starting point for a MIDI instrument. Choose Vocals / humming, record in a quiet room, and sing one note at a time. Clear pitch and a little space between notes make the line easier to follow. Breath noise, talking, echo and background music may produce unwanted notes.

Once converted, listen to a short phrase in Audio and then MIDI. Check whether each note starts and ends where you expect. Raise Note sensitivity if quiet notes are missing; lower it or increase Shortest note if the result contains too many little blips. After conversion, these controls update the notes without rerunning the model.

The Bass preset also tracks one pitch at a time. Piano / keys and Guitar can retain simultaneous notes, so use those for an isolated chord part. No preset guarantees a perfect transcription: overlapping sounds, reverb and distortion can obscure notes, and manual editing is often needed.

M4A files and browser support

M4A is a container, and its audio codec determines whether a browser can decode it. If your recording does not open, try another browser or export a WAV or MP3 and use WAV to MIDI or MP3 to MIDI. The same free converter also accepts a range of other audio formats; see audio to MIDI. For a video file, see MP4 to MIDI: only its audio track is analyzed.

Files can be up to 10 minutes. For a longer rehearsal or voice memo, export the phrase you want in shorter sections. This makes the result easier to inspect and reduces the amount of audio your browser needs to process at once.

A full song versus an isolated part

If an M4A contains a complete song, Full song tries to read the combined sound. It does not assign every performer to a separate MIDI track. Drums and overlapping instruments can add clutter, while quieter notes may be missed. A solo recording is a better starting point.

To isolate a part first, try the stem splitter, Piano Extractor or Acapella Extractor. These are separate cloud tools that upload audio and use credits. Eligible new users get 5 free credits with Google sign-up and no card needed. Review the displayed cost and pricing before splitting; then download the part and return to the free MIDI converter. Separation can leave traces of other sounds, so listen to the stem before converting it.

Preview, edit and use the MIDI

The piano roll shows the detected notes during playback. Switch between the original audio, MIDI with instrument sounds and MIDI with one sound to hear the result. Snap to beat aligns notes to a detected beat when one is available; turn it off if the performance is freely timed or the grid is unsuitable. The BPM is displayed only when a usable beat is detected. Keep pitch bends can include pitch movement, and Transpose moves notes by semitones.

Drag the downloaded file into a software instrument track in FL Studio, Ableton Live, Logic Pro or GarageBand. Pick a sound and correct the notes in the piano roll while comparing with the original memo. MIDI holds note events rather than the original voice or instrument timbre, so keep the M4A if you want that sound later. See what is a MIDI file? for an explanation.

To make notation, import the MIDI into MuseScore or another score editor. Adjust rhythms, rests and voices as needed; a performance converted from a phone recording will not necessarily become a clean score automatically.

Keep the original while editing

When you bring the MIDI into a project, place the original memo on a separate audio track. Play a few notes of each in turn and correct pitch and duration where they differ. A performance may contain slides or loose timing that an automatic grid changes. Keep the settings that serve your arrangement, and save both the original recording and the edited project for later.