Turn an MP3 into a rough MIDI sketch with note detection in your browser — useful for practice, remix ideas and further editing in a DAW.
Drop an MP3 file here
or click to choose from your computer
MP3 · MPEG audio · best with a solo melody
The tool estimates single-note pitches from a clear melody and writes them to a MIDI file. Polyphonic songs and full mixes may produce approximate results.
Converting…
MP3 is recorded audio. MIDI is a sequence of note events, not a waveform. Converting one into the other is an approximation: the tool analyzes pitch over time and writes a Standard MIDI File you can open in a DAW or score editor.
Results work best on clear monophonic lines (melody, solo instrument, simple voice). Dense mixes, drums and heavy effects produce less accurate notes. Treat the MIDI as a starting sketch, not a finished transcription.
For a cleaner result, crop the recording to one lead line, avoid reverb-heavy sections, and use a passage with distinct notes rather than chords. The browser estimates pitch from the waveform, so repeated notes, vibrato and overlapping instruments can be interpreted imperfectly.
Everything runs locally in the browser. You download a .mid file and can quantize or re-voice it in your own software.
Converting MP3 to MIDI on Sound Booster happens entirely in your browser: you add the MP3, the tool estimates the notes of the melody, and you download a Standard MIDI file (.mid) without installing desktop software. Keep this tab open until progress reaches 100% so the file can be finished.
The page always outputs MIDI, so there is no format to choose. Short, clean recordings finish in a few seconds; longer files take more time because every part of the recording is analysed for pitch.
Drop an MP3 file on the panel, choose it from disk, or open it from Your Library. For the best result use a recording with one lead line: a solo instrument, a whistled or sung melody, or a simple riff. Trim long intros and silence first if you only need one passage.
Click Convert to MIDI. The MP3 is decoded, the pitch is tracked over time, and each steady pitch becomes a note with a start time, a length and a velocity based on loudness. Progress shows as a percentage while this runs on your device.
Click Download to save the .mid file. The result line shows how many notes were detected, which is a quick sign of whether the source was clear enough. You can also save the file to Your Library.
Open the MIDI in a DAW or notation editor such as Ableton Live, Logic, FL Studio, Reaper, MuseScore or Dorico. Assign any instrument, then fix wrong or missing notes and quantize the timing. Expect to edit: the output is an estimate, not an exact transcription.
MP3 is a lossy compressed audio format: a recording of sound waves, not of notes. Everything is mixed together (instruments, voice, effects, room sound), so the file does not say which notes were played. That is why turning an MP3 into notes means estimating pitch from the waveform.
A MIDI file (.mid) contains no sound. It stores note events: which pitch starts, when, how long it lasts and how hard it is played. The files are tiny and fully editable, and they sound like whichever instrument you assign in your DAW or notation software.
What this converter writes: a single-track Standard MIDI file with one note at a time, covering roughly C2 to C7, at a fixed tempo of 120 BPM. Note velocity follows the loudness of the recording. Pitches outside that range, and sections where no clear pitch is found, are skipped. If your song runs at another tempo, adjust the tempo or time-stretch the MIDI in your editor.
Polyphony is the main limitation. Because the tool follows a single pitch, chords, harmonies, full mixes and drums will not be transcribed correctly. You will usually get the most prominent line, plus some wrong or jumping notes. For multi-instrument music, isolate one part first, or treat the result as a rough guide to the tune.
Hum, sing or play a tune into your phone, then convert the MP3 to get the notes. Drop the MIDI into a DAW and try the line on any synth or instrument.
Import the .mid file into MuseScore, Dorico or Sibelius to get a rough score of a simple tune. Fix rhythm and note lengths by hand before printing or sharing.
See a lead line as notes in a piano roll to check what you hear. Handy for practice, covers and figuring out riffs from a solo recording.
Replace a thin recorded lead with a synth, strings or piano, or use the notes to trigger a sampler. Quantize and transpose in your DAW to fit the rest of the track.
No. MIDI contains estimated note events rather than recorded sound. Use it to edit a melody with instruments in a DAW; it will not preserve the original voice, effects or mix. Treat the first MIDI export as a draft that may need note cleanup before arranging or notation.
No. Audio decoding, pitch estimation and MIDI file creation run locally in your browser.
Yes on this page, without a mandatory account.
This browser tool estimates one melody line from the waveform. Chords, drums, vibrato and overlapping instruments can confuse pitch tracking, so review the MIDI notes before using them in a finished arrangement.
Try Chrome or Edge, a shorter file, and keep the tab open until progress reaches 100%.
A clear, single-note melody with limited accompaniment is generally easier to estimate than a dense full mix. Strong drums, layered chords, reverb, and overlapping voices can confuse note detection, so a clean lead instrument or vocal line is a better starting point.
Yes. Import the downloaded MIDI into a DAW or notation app, then assign an instrument and review the note timing. MIDI stores note events rather than the original audio, so the playback sound will depend on the instruments and settings in that application.
