MP3 to MIDI Converter — Turn Audio into Editable MIDI Notes
This MP3 to MIDI converter turns an MP3, or the stems you just split, into an editable MIDI file of the melody, bass line, or chords for your DAW. Free to try.
Converting a full song? Split it into stems first
What Is an MP3 to MIDI Converter?
An MP3 to MIDI converter is a tool that listens to a recording, works out which notes are played and when, and writes them as MIDI notes your DAW can edit and play with any instrument. Stem Splitter AI's converter runs the open Basic Pitch model in your browser, so nothing is uploaded, offers settings for melody, piano, guitar, and bass, shows the notes on a piano roll, and saves a free .mid file with the recording's tempo. It works best on one instrument or a separated stem.
How do you check the MIDI before you download it?
The MP3 to MIDI converter shows the notes on a piano roll as soon as the audio is read, and plays them with a simple synth, alone or over the recording. Listen for wrong octaves, extra short notes, and chords where there should be a single voice.
If the result is busy, pick the setting that matches the part, melody, piano, guitar, or bass, and adjust what is kept until only the real notes are left.
How close is the MIDI to the original MP3?
An MP3 to MIDI converter does not change the file type the way an MP3-to-WAV converter does. It listens to the recording, works out which notes are playing and when, and writes those notes into a MIDI file.
On a single instrument, such as a sung melody, a bass line, or a solo piano, most notes land on the right pitch and close to the right time. On a full band mix, the notes of every instrument pile into one track. That is why the best input for MP3 to MIDI is a stem.
| Input | What the MIDI looks like | Best setting |
|---|---|---|
| Vocal stem or whistled melody | One clean line; slides become short steps | Melody |
| Bass stem | One low line, usually very accurate | Bass |
| Solo piano or piano stem | Chords and melody together | Piano |
| Guitar stem | Chords and riffs; strums can split up | Guitar |
| Full mixed song | Every instrument in one track; busy and hard to edit | Split into stems first |
Why do most MP3 to MIDI converters give you a mess?
Plenty of sites list "MP3 to MIDI" next to their file converters, upload your song, and hand back a file that is mostly noise: hundreds of tiny notes, chords where there was a single voice, and drum hits turned into random pitches. There is nothing to check before you download, so you only find out in the DAW.
Good MP3 to MIDI transcription needs two things those converters skip. It needs a model trained on real instruments, and it needs one instrument at a time, because no transcription can untangle a full mix into neat parts by itself.
Why convert MP3 to MIDI here?
See the notes before you save
A piano roll shows every note the MP3 to MIDI converter found. Play it alone or over the recording.
Settings per instrument
In the MP3 to MIDI converter, melody and bass keep one note at a time; piano and guitar keep chords. Each sets a sensible pitch range for that part.
Tune what is kept, instantly
Move sensitivity and minimum note length and the piano roll redraws at once, without converting the file again.
Private and free
The MP3 to MIDI conversion runs in your browser, with no account, limit, or watermark.
Ready for your DAW
The .mid file carries the tempo read from the recording and an instrument for the part, so it lands near the grid when you drag it in.
Why split a song before converting audio to MIDI?
One instrument in, one clean part out
Run the song through the stem splitter, save the vocals, bass, piano, or guitar stem, and convert that stem from MP3 to MIDI. The model only hears the part you want, so the MIDI has far fewer stray notes than a full mix gives.
Basic Pitch, an open transcription model
The MP3 to MIDI notes come from Basic Pitch, a model released by Spotify’s audio research team under the Apache 2.0 licence. It handles voices and most pitched instruments, and its output includes note strength, which becomes MIDI velocity.
Basic Pitch on GitHubWhich audio files can you turn into MIDI?
MP3 to MIDI works on any recording with pitched notes. Drums are not transcribed.
| Input | Details |
|---|---|
| Audio | MP3, WAV, FLAC, AIFF, M4A, AAC, OGG, Opus; stems from the stem splitter |
| Video | MP4, MOV, M4V, WebM, MKV; the soundtrack is converted |
| File size | Up to 150 MB |
| Length | Up to 10 minutes per file |
| Output | Standard MIDI File (.mid), one track, tempo included |
| Price | Free, no account |
How do you convert MP3 to MIDI?
- 1Choose the audioDrop an MP3, WAV, or stem into the MP3 to MIDI converter.
- 2Wait for the notesThe model listens to the whole file and draws a piano roll.
- 3Tune and listenPick the part type, adjust sensitivity, and play it back.
- 4Download the .midSave the file and drag it onto an instrument track.
What do people use audio to MIDI for?
Producer replacing a sound
Splits a demo, converts the bass stem from MP3 to MIDI with the Bass setting, and plays the line on a new synth in the DAW.
A bass line as MIDI to re-voice and quantize.
Songwriter with a voice memo
Hums a melody into a phone, exports it as MP3, converts the MP3 to MIDI with the Melody setting, and opens it in notation software.
A melody to harmonise or print as sheet music.
Piano student
Converts the piano stem of a song from MP3 to MIDI to see which notes and chords are played, slowed down on the piano roll.
A part to learn from or load into a piano app.
Which tool comes before or after MIDI?
MP3 to MIDI works best as the last step, after the part is isolated.
| What you need | Tool | What you get |
|---|---|---|
| Notes from a recording | MP3 to MIDI Converter | A .mid file |
| One instrument out of a full song | Stem Splitter | Vocals, bass, guitar, piano, drums, other |
| The vocal melody only | Vocal Isolator | Acapella to convert |
| The key and tempo for your project | BPM & Key Finder | BPM, key, and Camelot code |
Is your audio uploaded when you convert it to MIDI?
No. MP3 to MIDI conversion here happens inside your browser: the file is decoded and transcribed on your device, and the model itself is downloaded once. Nothing is sent to any server, and it is gone when you close the page.
MP3 to MIDI FAQ
Is the MP3 to MIDI converter free?
Yes. It runs in your browser with no account, watermark, or daily limit. Files up to 150 MB and 10 minutes long work.
Can it convert a whole song with drums and vocals?
It will, but MP3 to MIDI on a full mix puts every instrument in one track, and the result is hard to use. For a clean part, split the song first and convert one stem.
How does it compare with Melodyne or paid MIDI converters?
Melodyne and similar paid tools give you more control for editing notes one by one, and they need an install. This converter is free, runs in the browser, and uses the open Basic Pitch model, which Spotify reports is comparable in accuracy to other transcription systems. For one clean instrument it is often enough; for detailed polyphonic editing, a desktop tool does more.
Does MP3 to MIDI transcribe drums?
No. The model reads pitched notes. Drum hits either disappear or show up as stray notes, so convert a stem without drums for the best result.
How accurate is MP3 to MIDI conversion?
For one clear instrument most notes come out at the right pitch and close to the right time. Expect to fix some note lengths, fast runs, and slides in your DAW, as with any automatic transcription.
Will the MIDI match the tempo of my song?
The MP3 to MIDI file is written at the tempo read from the recording, so bars in your DAW line up with the beat for most songs. Notes keep their real timing; quantize them in your DAW if you want them on the grid.
Can I convert WAV, M4A, or a voice memo?
Yes. Any of the listed audio formats work, and so does the soundtrack of a video. A clean, close recording gives the best notes.
Turn your MP3 into MIDI now
Drop a recording into the MP3 to MIDI converter, check the notes on the piano roll, and save the .mid file. Free and private.
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