Low-level truth
Notes shown in the piano roll are a projection of the original event timeline. Program, controller, pressure, pitch-bend, SysEx, and metadata events remain part of the document.
Private by default
Edit MIDI online
Drop a MIDI file, start a blank piano roll, or open a public demo. Editing stays in this browser. Nothing is uploaded unless you choose Creator Cloud.
Drop a MIDI file to edit
Stay on-device. Start empty if you have no file, or try a public demo.
Off-grid notes, wild velocities, leftover gaps — the dirty AI-song export producers actually get.
A clean four-bar piano phrase you can transpose, quantize, or reshape immediately.
Drums, bass, and chords on separate tracks for mute, solo, and merge practice.
The same hook after quantize and velocity cleanup — the after shot for the messy export.
Local parsing and editingExact untouched-file exportClear format limits
Where do you start?
I have a Suno or AI-song MIDI export
Quantize it and fix uneven velocity in the Suno cleanup tool.
I have a MIDI file to fix
Open it in the full piano roll, or use transpose, tempo, or quantize for one job.
I have a recording and want MIDI
Start with audio to MIDI, or go straight to MP3 to MIDI, WAV to MIDI, or vocal to MIDI.
I have MIDI and want audio
Render the note timeline to a WAV or MP3 on this device with MIDI to MP3.
Choose one job
Focused MIDI tools, one shared engine
Every tool uses the same event-preserving MIDI core, with a workflow tailored to the change you need.
Edit and arrange
Use the complete piano-roll workspace when one file needs several changes.
Play and inspect
Listen to a file, read its piano roll, and turn the note timeline into audio without leaving the browser.
02Listen & inspect
MIDI Player
Preview tracks, scrub the timeline, loop a range, mute, and solo.
Open tool →03Read the notesPiano Roll Viewer
See every note, its pitch, length, velocity, and channel in a .mid file.
Open tool →04Export audioMIDI to MP3
Render the note timeline to a local WAV or MP3 with the bundled SoundFont.
Open tool →Focused changes
Take a shorter path when the file needs one clearly defined operation.
05Change key
MIDI Transpose
Shift pitched notes while leaving drum channel 10 unchanged by default.
Open tool →06Set BPMTempo Changer
Replace a complex tempo map with one clear BPM at tick zero.
Open tool →07Fix timingMIDI Quantizer
Snap note starts and ends to a grid without creating zero-length notes.
Open tool →08Shape dynamicsVelocity Editor
Set positive note-on velocity from 1 to 127 while preserving other events.
Open tool →Audio and AI cleanup
Turn a short local recording into an editable draft, or clean a generated MIDI export.
09Melody draft
MP3 to MIDI
Trace one clear melody into a rough 30-second draft, then edit it.
Open tool →10Clean inputWAV to MIDI
Draft notes from an uncompressed recording with no lossy artifacts.
Open tool →11Melody sketchAudio to MIDI
Turn a clear monophonic recording into a rough piano-roll sketch.
Open tool →12Voice to notesVocal to MIDI
Hum or sing one line and get editable notes back in the piano roll.
Open tool →13AI-song cleanupSuno MIDI Cleanup
Quantize and fix velocity on messy AI-song exports before download.
Open tool →MIDI is event data
Keep the file intact around your edit
Honest preview
The player loads a small bundled SoundFont and visibly falls back to an oscillator if that bank fails. A separate local workflow turns note starts, lengths, velocities, and channels into a full-duration WAV or MP3 with the bundled piano-and-hat bank. Program changes, controllers, sustain, and pitch bend are not rendered.
Undo as one action
Transpose, tempo, quantize, and velocity changes enter history atomically, so one Undo restores the complete state before that operation.
Start in 10 seconds, even without a file
Start with the action that fits your file: drop a .mid, click New empty MIDI, or open a hosted demo such as a messy Suno export. Public demos never touch your private files, and format details remain available in Docs when you need them.
When you only need one job, jump to transpose, tempo, quantize, or velocity. Those four tools share this engine and send you back here when the edit needs a fuller pass.
Make precise changes without rebuilding the song
EditMIDI is designed for files that already exist. An untouched download returns the original bytes. After an edit, controllers, programs, tempo, SysEx, and other events you did not change stay in the file. Choose a sequencer or DAW when you need to compose and mix a full arrangement from scratch.
That is why dirty AI-song MIDI and rough melody drafts belong here. Quantize, velocity, transpose, merge, and a compatibility check are the same motion after a Suno export or a 30-second monophonic sketch.
Privacy, formats, and what we will not fake
Parsing, editing, preview, recovery, and MIDI export run in the browser. Opening a local tool does not upload the file. After an edit, one recovery copy stays in IndexedDB on this device until you replace or clear it.
Type 0 and Type 1 PPQ files up to 5 MB and 20,000 events are supported. Local WAV and MP3 output is a full-duration note render with the bundled piano-and-hat SoundFont for timelines up to five minutes. Program changes, MIDI controllers including sustain, volume, expression, and pan, pitch bend, external instruments, effects, and finished mix settings are not rendered. Audio-to-MIDI drafts still trace only one dominant melody from the first 30 seconds.