MP3 to MIDI

What works best

• A hummed melody or sung hook
• A whistle, flute phrase, or monophonic synth lead
• A bass line or clean guitar single-note riff

Leave out drums, backing chords, and reverb-heavy room sound. The cleaner the melody contour, the better the MIDI follows it.

What this page doesn't do

This is not a full multi-track transcription service 鈥?it does not split a complete song into drums, chords, bass, and vocals. If several notes play at once, the detector follows one dominant pitch.

That boundary is deliberate: local conversion is fast, private, free to try, and needs no account.

Supported files & output

Select MP3, WAV, FLAC, OGG, M4A, MP4, MOV, MKV, or WebM 鈥?audio inside video files is used when the browser can decode the codec. FLAC, OGG, WebM, and MOV use the same local conversion path; no separate format workflow is needed. You download a Standard MIDI .mid file, ready to open in any DAW, notation app, or MIDI editor.

How to check whether it worked

A useful result has three signs: the file is not 0 bytes, it opens correctly, and the notes rise, fall, and repeat in roughly the same pattern as the melody you hear in the source.

If the result is full of unrelated notes, simplify the input 鈥?a shorter clip, a closer microphone, or less background noise usually helps more than raising sensitivity.

Pass 1: name the line

Play a five-to-fifteen-second MP3 once without looking at the waveform. Hum or sing the one line you expect the MIDI to follow. If you cannot identify one line because a vocal, bass, chord, and drum hit arrive together, do not use that section as the test.

Then write down one simple reference: for example, “three notes rise, the top note repeats, then there is a short pause.” That is enough to evaluate a first conversion without pretending every note must be exact.

Pass 2: compare the contour

Convert the MP3 and open the MIDI file. Ignore velocity and tiny timing differences at first. Check whether the notes rise where your phrase rises, whether repeated notes remain repeated, and whether silence remains visible as a gap.

If all three signs are present, keep the download as a sketch. Correct a soft note onset, a slide, or one wrong octave in your MIDI editor. This is the normal handoff from a recording to an editable note line.

Pass 3: find the exact failure

When the contour breaks, replay only that half-second of the MP3. A backing chord, bass entrance, drum resonance, or reverb tail often appears at the same point. Trim before that moment, use another exposed phrase, or export the solo part if you have it.

Use the result as MIDI, not replacement audio

The downloaded file contains note events. Open it in Ableton Live, FL Studio, Logic Pro, Reaper, a notation app, or another MIDI editor and choose the sound there. It will not preserve the singer, guitar tone, mix, or mastering of the original MP3.