noteline

MP3 to MIDI.

Turn a melody into editable MIDI notes.

Audio stays on this device

Audio input

ONE FILE
Supported formats100 MB · 10 min max

MIDI output

.MID
Your notes will appear here
Notes
—
Tempo
—
Key
—
Download .mid

Supported formats

Choose one file, up to 100 MB and 10 minutes. These file and codec combinations were tested in Chrome on Windows.

  • MP3
  • WAV (PCM)
  • FLAC
  • M4A (AAC)
  • AIFF (PCM)
  • Ogg (Vorbis)
  • AAC (ADTS)
  • Opus (.opus)
  • MP4 (AAC)
  • MOV (AAC)
  • WebM (Opus)
  • MKV (Opus)

Codec support can vary by browser. Video files are transcribed from their audio track.

How it works

Choose a file, select Convert to MIDI, then download the .mid file. This audio to MIDI converter decodes the recording in your browser and tracks the dominant pitch over time. It writes the resulting note starts, lengths and velocities to a Standard MIDI File.

Tempo and key are estimates. When there is too little rhythmic evidence, the MIDI uses a 120 BPM grid. If the key is unclear, the file omits the key signature. Neither setting moves the detected notes.

What converts well

Try a clear melody played or sung one note at a time. Chords, drums and full mixes can produce missing or extra notes. The output follows one pitch at a time and uses a single tempo. Check the result against the recording in your music software.

Test clips. A synthetic melody returned all 16 reference pitches in order. A synthetic bass line returned all 8 reference pitches in order. The vocadito solo vocal clip 10 produced 41 notes. The vocal notes were checked for valid MIDI structure.

FAQ

Can I use this as a WAV to MIDI converter?

Yes. Choose a WAV file and follow the same steps. You can import the .mid download into a DAW, notation editor or other software with MIDI support.

What if my file cannot be decoded?

ALAC in M4A, WMA and AVI failed in the tested Windows Chrome setup. Video without an audio track also failed. Export the sound to MP3 or PCM WAV and try again.

Can I convert a whole song?

You can choose a file within the size and duration limits. For a layered song, start with an isolated vocal, bass or lead track for a more usable transcription.

Where does my file go?

Audio is read and processed in this tab. The .mid is saved by your browser when you download it. Reload the page to clear the session.