One file.
Select an audio file or a video with audio. No registration, batch queue, or saved history.
THE BROWSER WORKSPACE
MP3 to MIDI.
One recording.
Editable note data.
AUDIO → NOTE DATALOCAL PROCESSING
01 / INPUTONE FILE AT A TIME
Preparing file…
02 / OUTPUTAWAITING AUDIO
NOTE PREVIEW
Your notes appear here.
Generated from your actual conversion.PITCH ↑TIME →
Your MIDI is ready.
Detect notes. Review the shape.
Take the result into your DAW.
Your file stays in this tab. Nothing is uploaded.NO ACCOUNT · NO HISTORY
Best with a clear melody or an isolated instrument. Know the limits
01
BRING YOUR RECORDING
Audio in. Notes out.
This audio to MIDI workflow accepts the formats below. For video, only the audio track is decoded. Container support does not guarantee that every codec or damaged file can be read.
Audio inputs
- MP3
- WAV
- FLAC
- OGG
- M4A
- AAC
- AIFF / AIF
- OGA
- Opus
Video / container inputs
- MP4
- MOV
- MKV
- WebM
- M4V
- AVI
Browser decoding is tried first where appropriate. A locally loaded FFmpeg decoder handles the fallback. Files with no audio track cannot be transcribed.
02
NO DETOUR REQUIRED
From a recording
to a starting point.
In this tab.
Spotify Basic Pitch detects pitched note events after local decoding. The first conversion loads the model.
Make it yours.
Inspect the piano roll, then save a Standard MIDI file. Assign an instrument and edit it in your DAW.
03
AN HONEST STARTING POINT
Notes, not the
original sound.
Start with a clear source
A solo instrument, prominent melody, or isolated vocal line is easier to inspect than a dense mix. This is transcription, not instrument separation.
Keep room for cleanup
Overlapping instruments, drums, distortion, reverb, and quiet passages can produce missed or extra notes. The preview is not an accuracy score.
Work within your device
Audio and model data use this tab’s memory. Long recordings take more time and may exceed a device’s resources. Phone performance varies.
Read the output correctly
The export contains one detected-note track with note timing, pitch, duration, and velocity. It does not reproduce the source instrument or guarantee pedal and pitch-bend events.
04
THE SHORT ANSWERS
Before you press play.
Is this MP3 to MIDI converter free?
Yes. There are no accounts, credits, or payment steps. The conversion runs on your device, using the included model and decoder.
Which audio formats can I convert to MIDI?
The audio to MIDI converter accepts the input extensions listed above. WAV to MIDI uses the same tool as MP3. No separate format page or account is needed.
Is my audio uploaded to a server?
No. The page reads your chosen file inside the browser. Model and decoder files are loaded from this site; your audio is not sent to an external conversion service. Closing the tab clears the in-page session.
Can I get sheet music instead of a MIDI file?
This MIDI converter exports a .mid file, not a score. Import the MIDI into a notation editor if you need sheet music, and check the detected notes before using the score.
Does it work on a phone?
The controls are designed for a narrow browser window. Conversion still depends on that browser’s audio decoding, model support, memory, and performance. A responsive desktop test is not a physical-phone accuracy or speed test.
FROM THE WORKBENCH
The file is just
the beginning.
Original experiments to help you inspect and edit your MIDI. Read the results, download the controls, check the limits.
SELECTED FIELD NOTESSources. Methods. Limits.
SAVED WAV CONTROLS / PARSED NOTE INTERVALS
NEW / WAV-TO-MIDI FILE-LEVEL CONTROLSame WAV.
Same WAV.
Every parsed event.
Two retained controls compare direct WAV MIDI with three serial 64 kbps MP3 generations, using parsed note fields and downloadable evidence.
Inspect the WAV-to-MIDI comparisonSAVED FIRST-ONLY CHAIN / PARSED NOTE INTERVALS
NEW / ONE-SOURCE GENERATION TABLESame audio.
Same audio.
Every note field.
One saved WAV-to-G3 chain compares parsed MIDI events, fixed settings and capture dates in a single table.
Inspect the generation tableKEEP EXPLORING
Experiment archive
Browse all field notes.
SERIAL ENCODING CONTROLS
One encoding. Then another.
Actual parent hashes, decoded samples and parsed MIDI compare serial MP3 generations, with new inference separated from retained anchors.
Inspect the serial generations FIXED-SOURCE ENCODING CONTROLSSmaller files. Separate note fields.
Native MP3 encodings of two unchanged WAVs compare actual file sizes, parsed MIDI geometry and velocity, with old captures labelled.
Inspect the bitrate controls INDEPENDENT BOUNDARY SWITCHESOne boundary. Then the other.
First-only and second-only phase restarts add new matched controls, with actual MIDI intervals, conditional differences and labelled anchors.
Inspect the boundary matrix EXACT-CYCLE SOURCE CONTROLSA reset. Or the same samples.
Exact-cycle and off-cycle phase pairs compare actual source bytes, captured model outputs and MIDI, with every reuse labelled.
Inspect the phase boundaries INDEPENDENT SOURCE INTERVENTIONSTwo changes. Separately.
Phase and edge envelopes tested independently, with fresh inference distinguished from exact-input retained anchors.
Inspect the phase and envelope matrix AUTHORED AUDIO / OFFLINE CPUA hold. Three attacks.
Eight generated WAV and MP3 inputs compare authored timing with actual captured model outputs and MIDI events.
Inspect the held and repeated tones GENERATED-MIDI COUNTEREXAMPLEA gap. Not an intention.
Seven intentional repeated-note controls expose what same-pitch joining retains and removes.
Inspect the repeated-note counterexample RETAINED-MIDI EDITJoin a pitch. Keep the others.
Five same-pitch gap cases show actual event counts, held time and original-member provenance.
Inspect fragment joining INDEPENDENT INTERVENTIONSTwo edits. Different overlaps.
Start-only and duration-only grid edits produce different interval geometry, with every pair recorded.
Inspect the independent edits RETAINED-MIDI EXPERIMENTA grid moves notes. It keeps their pitches.
Five grid cases show actual start and duration changes, with retained originals and parsed MIDI.
Inspect the grid test FIXED-OUTPUT EXPERIMENTA pitch window. Not a source separator.
Seven boundary cases show reference-note losses and a surviving upper event, with actual parsed MIDI.
Inspect the frequency test FIXED-OUTPUT EXPERIMENTFewer notes. Not always safer.
Six tied detection thresholds show when extra pitches disappear and reference notes are lost.
Inspect the sensitivity test FIXED-OUTPUT EXPERIMENTLength is a filter. Not a pitch decision.
Six minimum-length extractions of fixed model outputs. Real MIDI shows what survives and what disappears.
Inspect the length test ACTUAL BROWSER EXPORTSame count. Different notes.
Actual browser downloads cross-checked against retained offline MIDI from identical inputs.
Inspect the export cross-check HARMONIC INPUTOne tone. Several notes.
Matched partial controls separate higher pitches from repeated note fragments.
Read the harmonic test INPUT SIGNALTwo channels. One cancelled melody.
Six generated controls isolate what disappears before note detection.
Read the stereo control 01 / DYNAMICSSource volume is not note velocity.
Quiet, medium and loud controls. Actual exported values, not an accuracy score.
Read the velocity test 02 / TIMINGTempo changes. Ticks and seconds.
Four downloadable MIDI files show the difference between ticks and seconds.
Read the tempo test 03 / BOUNDARIESOne held tone. Split note events.
Inspect exported note boundaries before fixing the performance in your DAW.
Read the split-note testNo field notes match that search. Try a broader term.
Evidence, controls, and limits. Not accuracy scores.