Audio to MIDI Converter Online
Turn any audio recording into editable MIDI notes — upload MP3 or WAV, preview the transcription, fine-tune it, and download, all in your browser.
- MP3 / WAV
- Piano roll preview
- Sheet music export
Click a note to hear it
What is audio to MIDI?
Audio to MIDI is the general process of converting any recorded sound — an MP3, WAV, stem, or voice memo — into MIDI notes. Where the audio file stores a waveform, the MIDI file stores the underlying performance: which notes played, when, and how hard, all fully editable after the fact.
A transcription model estimates the pitches in your recording and lays them out on a timeline. From there the notes are yours to quantize, transpose, re-voice with any instrument, or export as a score — the recording becomes raw material instead of a finished, fixed track.
How it works
Upload your audio
Drop an MP3 or WAV recording. No account needed to convert and preview — transcription 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, correct wrong notes directly on the roll, or export sheet music as MusicXML/PDF for MuseScore, Sibelius, or printing.
Formats & limits
- Input formats
- Audio
- Output
- MIDI
- File limits
- 50 MB · 10 min
- Price
- Free · no sign-up
Highlights
Any common audio in
Bring MP3, WAV, and other everyday recordings through a single uploader.
Editable timeline
Every detected note is movable, deletable, and transposable on the piano roll.
Export anywhere
Save as .mid for your DAW, or MusicXML/PDF for notation software.
Getting the cleanest transcription
- Audio to MIDI works best on monophonic sources — a single melody line such as vocals, flute, or lead guitar transcribes far more accurately than a dense mix.
- 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 re-recording.
Frequently asked questions
What is audio to MIDI conversion?
Audio to MIDI conversion listens to a recording — any recording, not a specific format or instrument — and detects the pitch, timing, and velocity of the notes being played, then writes them out as a MIDI file: editable performance data instead of a fixed waveform. That distinction matters because the original audio's sound is gone once converted; what you keep is a set of instructions any instrument can play back, note by note, which is what makes MIDI useful for re-instrumenting a part, transposing a melody into a different key, studying how a solo is constructed, or feeding a rough recorded idea into a DAW as something you can actually rearrange rather than just listen to on repeat. The conversion is one-directional in the sense that the original timbre never comes back, but that trade-off is precisely what turns a fixed recording into raw material you can keep reworking.
What audio formats can I convert to MIDI?
MP3 and WAV uploads are both accepted, capped at 50 MB and roughly 10 minutes per file — this page is the general entry point for whichever of those two formats you happen to have, rather than a format-specific tool. For best results, use a dry, monophonic recording: a single melodic line such as vocals, a solo instrument, or a lead line without heavy accompaniment underneath it, since that is the kind of material the underlying transcription model was evaluated on. Mixed or densely layered audio will produce more wrong or extra notes regardless of which of the two formats you upload, so the format choice matters far less than how clean and isolated the actual musical content is. If your file uses a different container entirely — FLAC, OGG, or a video file — dedicated pages for those formats exist elsewhere on this site.
Is this audio to MIDI converter free?
Yes — converting and previewing is completely free, with no account required at any point. Upload an MP3 or WAV, watch the transcription build on the piano roll, and listen back against the original immediately. What requires signing in is everything downstream of that first pass: saving results to a persistent conversion history, using the full note-editing tools (move, delete, transpose, re-quantize) rather than just previewing, and exporting sheet music as MusicXML or PDF alongside the MIDI download. In practice you can fully judge whether a given transcription is usable — hear it, compare it to your file, gauge how many notes look wrong — before ever deciding whether an account is worth creating, and a quick one-off MIDI download without editing needs no account at all — nothing about the free path is a limited demo of the paid one.
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 one fixed number — see our full instrument-by-instrument breakdown for the actual figures. As a rule of thumb, clean single-melody recordings such as a solo voice or 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 afterward. 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 — reusing the same upload, no need to submit the file a second time — if too many notes are missing or extra ones keep appearing — most transcriptions improve noticeably after one or two rounds of adjustment.