I tried my first MP3-to-MIDI converter around the time I was learning guitar by ear, hoping it would save me hours of rewinding. It gave me a piano roll that looked like someone had sneezed on it. Tools have got a lot better since, thanks to machine learning. But the one thing that hasn’t changed is this: what you feed in decides what you get out.
The short answer: the best free MP3 to MIDI converter is Spotify’s Basic Pitch (basicpitch.spotify.com). It runs in your browser, nothing is uploaded, and it handles chords as well as melodies. For good results, split the song into stems first and convert one instrument at a time. Full mixes and drums need different tools.
Key takeaways
- Single melodies convert well. A vocal, a flute, a lead synth or a bass line usually comes out close to right, needing only light tidying.
- Solo piano or guitar is decent with modern polyphonic tools, but expect clean-up.
- Full mixes convert badly with every tool. Separate the stems first.
- Drums need a drum-specific converter, such as Ableton’s drums mode or a dedicated drum transcriber.
- Always clean up by hand. Delete ghost notes, fix octave jumps, quantise gently. Ten minutes of tidying beats an hour of fighting.
First: why MP3 to MIDI is hard
An MP3 is sound: one wiggly waveform. MIDI is instructions: “play C4 now, this loud, for this long”. Converting means working out every note from the blended sound, which is called automatic music transcription. With one instrument playing one note at a time it’s fairly easy: find the pitch, note when it starts and stops (the same maths my vocal pitch monitor does live). With chords, overtones and twelve instruments at once, it gets very hard very fast, because every note’s harmonics overlap the others.
| Your audio | Typical result | Tip |
|---|---|---|
| Solo vocal or whistle | Very good | Watch for scoops becoming extra notes |
| Bass line (isolated) | Very good | Fix the odd octave jump |
| Lead synth, flute, violin | Very good | Vibrato may need pitch bend removed |
| Solo piano | Good | Sustain pedal smears note lengths |
| Strummed guitar | Fair | Chords come out, voicings are messy |
| Drums | Needs a drum tool | Melodic converters can’t read drums |
| Full mix MP3 | Poor | Split into stems first, always |
The MP3 to MIDI converters that actually work
Snapshot from October 2026. Prices and features change, so check before you buy anything.
1. Spotify Basic Pitch: best free online converter
Basic Pitch is an open-source model from Spotify’s audio research team, and the web version at basicpitch.spotify.com runs entirely in your browser, so your file isn’t uploaded. It’s polyphonic (chords work), it’s trained on many instruments rather than just piano, and it can output pitch bends for slides and vibrato. It doesn’t do drums, and it struggles with dense mixes, like everything else.
Settings worth knowing: raise the note segmentation and minimum note length sliders to get fewer ghost notes, and narrow the frequency range to the instrument you converted (a bass line doesn’t need notes above C4).
2. NeuralNote: Basic Pitch inside your DAW, free
NeuralNote is a free, open-source plugin (VST3, AU and standalone) that runs the Basic Pitch model inside your DAW. Record or drop audio in, drag MIDI out. Users report the odd extra note and a small timing offset, but for a free plugin it’s superb.
3. Fadr: free stems and MIDI in one go
Fadr splits a song into stems (vocals, drums, bass, synths, other) and gives you MIDI for the melodic parts, plus key and BPM. It’s the fastest free way to go from a full MP3 to “roughly the bass line and chords as MIDI”. Quality is good enough for remix sketches.
4. Ableton Live: best built-in DAW option
Live Standard and Suite have Convert Melody to New MIDI Track, Convert Harmony and Convert Drums. Drums mode only finds kick, snare and hi-hats, but that’s exactly what you need to steal… learn a groove. If you already own Live, try it before anything else.
5. Melodyne: the accuracy king (paid)
Celemony’s Melodyne is the professional standard for pitch editing, and its note detection is excellent. Melodyne Essential handles one note at a time; the higher editions add polyphonic detection that can pick apart chords. It’s paid, but the editing tools mean the “clean-up” step is much quicker. Logic Pro users get a similar monophonic route via Flex Pitch.
6. Klangio apps: when you want notation, not MIDI
Klangio makes transcription web apps for specific instruments (Piano2Notes, Guitar2Tabs, Drum2Notes and a melody scanner) that output sheet music and tabs as well as MIDI. Free use gives you previews; full transcriptions are paid. Brilliant for learners who read notation.
The workflow that gets usable MIDI every time
- Split the song into stems. Run it through a stem splitter so the converter hears one instrument. My guide to removing vocals from a song covers the best free options; most also give you bass and drums.
- Find the tempo and key first. Drop the original into the BPM & key finder, set your DAW to that BPM before importing, and the notes land on the grid instead of drifting across bar lines.
- Convert one stem in Basic Pitch (or your DAW’s converter) and download the .mid file.
- Clean up. Delete notes shorter than a 32nd, fix notes an octave out, merge repeated notes that should be one long note, and quantise gently (50–70% strength keeps the feel).
- Check by ear. Play the MIDI with a piano sound alongside the original. Wrong notes jump out immediately.
Shortcut for melodies in your head: skip the MP3 entirely. Hum it, check each note with the pitch monitor, and tap it into the sheet music maker, which exports a clean MIDI file with zero ghost notes. Slower, but you’ll actually learn the tune.
What to do with your MIDI
- Swap the sound. Put that piano line on a synth pad, or the vocal melody on a cello.
- Learn it. Load it into a piano roll and play along on the online piano at half speed.
- Write it out. Turn it into notation for lessons or a lead sheet with the sheet music maker.
- Build something new. Use the chords as a starting point, change two of them with the chord progression generator, and you’ve got your own song. Describe it to an AI band in the Prompt Studio.
A quick word on copyright
Converting a song to MIDI doesn’t make the melody yours. Melodies and lyrics are protected as compositions, so a MIDI file of someone else’s tune is fine for study and practice, but releasing it (even with new sounds) needs permission. Use transcription to learn how great songs work, then write your own. That’s what every musician has always done, just with fewer rewinds.
Frequently asked questions
Can you convert an MP3 to MIDI?
Yes. Audio to MIDI tools detect the notes in a recording and write them as MIDI. Results are very good on single melodies and isolated bass lines, decent on solo piano or guitar, and poor on full mixes, so split the song into stems first and convert one instrument at a time.
What is the best free MP3 to MIDI converter?
Spotify’s Basic Pitch is the best free option. Its web version runs in your browser without uploading the file, handles chords as well as melodies and can output pitch bends. NeuralNote puts the same model in a free DAW plugin, and Fadr adds stem splitting.
Can I convert a full song to MIDI?
Not accurately in one go. Every converter struggles when many instruments play at once. Separate the song into stems such as vocals, bass and other, convert each stem separately, and use a drum-specific tool for the drums.
How do I convert drums from audio to MIDI?
Use a drum-specific converter. Ableton Live’s Convert Drums to MIDI detects kick, snare and hi-hat, and dedicated drum transcription apps go further. General melodic converters like Basic Pitch do not detect drums.
Why does my converted MIDI have so many wrong notes?
Overtones, reverb, chords and other instruments get detected as extra notes. Convert an isolated stem, raise the minimum note length and note segmentation settings, limit the frequency range, then delete very short notes and fix octave errors by hand.
Is it legal to convert a song to MIDI?
Converting for personal study and practice is generally fine, but the melody and harmony are still the original composer’s copyright. Releasing or selling music based on a converted MIDI file needs permission.
Write the melody out properly
The free sheet music maker turns notes into real notation with playback, then exports a clean MIDI file. No signup.
Open the sheet music maker →