AUDIO → EDITABLE NOTES

MP3 to MIDI Converter

This free MP3 to MIDI converter creates a clean, single-melody transcription you can inspect before downloading.

01 Add audio 02 Review notes 03 Save MIDI Stays on this device

Drop one audio file here or choose a file MP3 · WAV · OGG · M4A · AAC · FLAC

Note sensitivity Balanced

No sign-up. No file upload. Conversion runs in this tab.

RESULT

Your MIDI will appear here

Waiting for audio

Choose a clear melody, vocal line, or solo instrument for the cleanest first pass.

01 / INPUT

What converts cleanly

Use a dry recording with one clearly audible pitch at a time: a sung melody, bass line, lead, whistle, or solo instrument. MP3, WAV, OGG, M4A, AAC, and FLAC are accepted when your browser can decode them.

Chords, drums, heavy reverb, distortion, and full mixes overlap in frequency. This converter does not pretend those sources are single notes.

Before cutting a source excerpt, use the MP3 crop-boundary tests and downloadable first-note checklist to check what the saved clip retains.

If your recording sounds clipped, see Can you save clipped audio? Test results and a repair decision table.

Before recording another take, use the recording-versus-monitor control worksheet to check whether the volume control changes what is saved.

Not sure which problem “clipping” describes? Start with the audio-clipping explanation and guide map before choosing a repair, crop or recording-control investigation.

Comparing loudness readings? Keep the LUFS channel settings and true-peak units beside the source before changing its level.

Before reducing a noisy source, compare wanted sound and background noise separately; lower volume or a quieter gap alone does not establish cleanup.

Starting with separated audio? Check what each acapella export contains, not only whether its stems rebuild the mix, before transcribing the intended part.

If the waveform seems displaced, use the DC-offset confirmation checklist and dated correction tests before treating every click as bias.

02 / PROCESS

How audio becomes MIDI

The page decodes your file locally, folds stereo to mono, measures repeating wave periods, maps stable pitches to MIDI note numbers, and writes their start times and lengths into a standard Type 0 MIDI file.

The export uses a fixed 120 BPM timeline so detected real-time spacing is preserved when the file plays at that tempo.

A peak reading alone does not establish a damaged source: compare audio peaking, equal-peak tests and a downloadable evidence worksheet before choosing a repair.

03 / CLEANUP

What to fix by hand

Open the result in a piano roll and check three things first: sudden octave jumps, notes joined across a breath or pause, and short extras around consonants or pick noise.

Then adjust note starts, ends, and velocity to fit the performance you actually want—not merely the waveform the detector found.

PLAIN ANSWERS

Audio to MIDI FAQ

Is this the same as changing an audio file’s extension?

No. Audio contains a recorded waveform; MIDI contains note events. The converter detects a likely melody and creates new note data rather than repackaging the sound.

Can I use it as a WAV to MIDI converter?

Yes. WAV follows the same local workflow as MP3 to MIDI: choose the file, analyze it in your browser, inspect the detected notes, and download the .mid file.

Will it separate every instrument in a song?

No. This page produces one monophonic note track. Isolate the part you want before converting a dense mix.

Why is WMA not in the supported list?

Chrome does not provide dependable built-in WMA decoding. Convert WMA to one of the listed formats first; the page will not claim support it cannot verify.

Changing source levels? Check why a peak-normalized export can still have uneven passages before treating a matched peak as a balanced recording.

Starting from recorded sound? See what an audio-to-sheet-music transcription can establish about written pitch spelling before treating a matching playback as the original score.

Preparing audio before note edits? See how a defined echo can lengthen or add detected MIDI events, with saved inputs and reproducible results.

Keep note endings under control

MIDI quantization: compare moving starts with snapping both note edges, with downloadable examples and exact timing results.