MP3 to MIDI Converter Online
Upload any MP3 or WAV and get an editable MIDI transcription you can preview, fine-tune, and download — right in your browser.
- MP3 / WAV
- Piano roll preview
- Sheet music export
Click a note to hear it
What is MP3 to MIDI conversion?
MP3 to MIDI conversion turns a recorded audio file into a MIDI file — a set of editable notes with pitch, timing, and velocity instead of a fixed waveform. A neural pitch-detection model listens to the melody in your MP3 or WAV and writes out the notes it hears, so you can reopen the performance in any DAW or notation editor and change it.
Unlike the original recording, the resulting MIDI carries no sound of its own: it is instructions your software plays back with any instrument. That makes it ideal for re-scoring a song, transposing a melody, studying a solo, or turning a rough idea into a clean arrangement.
How it works
Upload your audio
Drop an MP3 or WAV file. No account needed to convert and preview — everything starts instantly in the browser.
Preview and fine-tune
Listen to the transcription on an interactive piano roll, compare it against the original audio, and adjust detection sensitivity, minimum note length, or pitch bends to re-transcribe.
Download MIDI or sheet music
Download the MIDI file, edit wrong notes directly on the roll, or export sheet music as MusicXML/PDF for MuseScore, Sibelius, or printing.
Formats & limits
- Input formats
- MP3
- Output
- MIDI
- File limits
- 50 MB · 10 min
- Price
- Free · no sign-up
Highlights
Piano-roll preview
Hear the transcription against the original on an interactive roll before you download anything.
Tunable detection
Adjust sensitivity, minimum note length, and pitch bends, then re-transcribe without re-uploading.
MIDI & sheet music export
Download a standard .mid file, or export MusicXML/PDF for MuseScore, Sibelius, and printing.
Getting the cleanest transcription
- Monophonic sources (a single melody line — vocals, flute, lead guitar) transcribe far more accurately than dense mixes.
- Trim intros, applause, and silence before uploading — cleaner input means fewer ghost notes.
- If you hear extra notes, lower the detection sensitivity; if soft notes are missing, raise it and re-transcribe.
- AI transcription is a starting point. Use the built-in editor to fix the handful of wrong notes instead of redoing it by hand.
Frequently asked questions
Is this MP3 to MIDI converter free?
Yes — converting and previewing is completely free, with no account required. Upload an MP3 or WAV, watch the transcription build on the piano roll, and listen back against the original immediately, all without signing up. What requires an account is everything downstream of that first pass: saving the result to your conversion history so you can return to it later, using the full note-editing tools (move, delete, transpose, re-quantize) instead of just previewing, and exporting sheet music as MusicXML or PDF alongside the MIDI download. In practice this means you can fully judge whether a transcription is usable — hear it, compare it to your original file, check whether the wrong-note count looks manageable — before ever deciding whether an account is worth creating. A quick one-off MIDI download without editing needs no account at all, and nothing about the free tier is a stripped-down preview: it's the same transcription engine either way, just without persistence and notation export.
What audio formats are supported?
MP3 and WAV uploads are accepted, capped at 50 MB and roughly 10 minutes per file. For best results, start from a dry, monophonic recording — a single melodic line such as vocals, a solo instrument, or a lead line without heavy accompaniment — since that is what the underlying transcription model was evaluated on, and mixed or layered audio predictably produces more wrong or extra notes regardless of file format. WAV has no fidelity advantage over MP3 here beyond avoiding compression artifacts at very low bitrates: both formats decode to the same audio data the model actually analyzes, so a high-bitrate MP3 and an uncompressed WAV of the same recording transcribe essentially identically. If your source runs longer than 10 minutes, trim it to the section you actually need first — shorter uploads also transcribe and preview noticeably faster.
How accurate is the transcription?
Transcription runs on Spotify's open-source Basic Pitch model, and its published research reports accuracy that varies noticeably by source material rather than being a single fixed number — see our full breakdown by instrument for the actual figures. As a rule of thumb, clean single-melody recordings (a solo voice, a lead instrument) come out close to accurate with only occasional wrong notes, while polyphonic, noisy, or densely mixed audio produces meaningfully more errors that need manual correction. Either way, treat the first pass as a draft: use the piano-roll editor to delete stray notes or fix octave errors, and re-transcribe with adjusted sensitivity if too many notes are missing or extra ones keep appearing — that re-transcription step reuses the same upload, so you can try several sensitivity settings without ever uploading the file a second time.
Can I edit the MIDI after conversion?
Yes — the workbench is built around editing, not just downloading a raw result. You can move, delete, and transpose individual notes, join or split them, adjust overall tempo, and re-transcribe the same upload with different sensitivity settings without starting over. This matters because no transcription model gets every note right, ours included: the editor is where you turn a rough first pass into a score you would actually use, whether that means removing a handful of stray notes, fixing an octave that landed wrong, or restructuring a section the model misread entirely because the source audio was dense or noisy. Once corrected, signed-in users can export the cleaned-up result as a standard MIDI file for a DAW, or as MusicXML/PDF sheet music for notation software or direct printing — no separate tool needed for either export.