Full note control
Pitch, position, length, and velocity per note — with multi-select for moving phrases and fixing whole passages at once.
MIDI Editor
Edit MIDI on a Browser Piano Roll
notes, under your cursor
A piano roll that respects your time
Open a MIDI file — or the notes you just transcribed from audio — and edit like you would in a DAW: drag, stretch, quantize, audition, export.
Notes render on the familiar grid — pitch vertical, time horizontal, velocity visible — and respond to the gestures you already know: click to add, drag to move, pull edges to stretch. Playback runs in the browser with selectable instrument sounds, so auditioning an edit never means exporting first.
It's deliberately not a DAW. No mixer, no plugin chains — just fast, precise note surgery. For sketching, correcting transcriptions, and preparing files for bigger sessions, that focus is the feature.
Sometimes you need thirty seconds of note editing and the DAW takes ninety seconds to boot. This editor lives in a browser tab: a piano roll with the operations that cover most MIDI work — move and resize notes, adjust velocities, quantize what's loose, transpose what's wrong, and hear every change instantly.
It pairs naturally with the audio-to-MIDI converter one door over: transcribe a hummed idea, land here to clean it up, and leave with a standard file any music software opens. The whole loop, capture to export, without installing anything.
The essentials, done properly
Quantize with judgment
Snap loose timing to the grid where the music needs it, and leave the humanity in where it doesn't. Strength is your call, per selection.
Instant audition
Play the edit back immediately with a choice of instrument voices. Hearing a change three seconds after making it is what keeps editing musical.
A typical editing pass
Whether the notes came from a file or a transcription, the same short sequence gets them clean.
- 1
Load and orient
Open the MIDI or continue from audio conversion, set a comfortable zoom, and play it through once before touching anything.
- 2
Fix pitch, then time
Correct wrong notes and octaves first — they're unambiguous. Then address timing, quantizing only the passages that actually stumble.
- 3
Audition and export
Play the full passage on a neutral instrument, listen for overlaps and stuck notes, then export standard MIDI for wherever the music goes next.
When a browser editor wins
Cleaning transcriptions
Audio-to-MIDI output lands here for the correction pass: octave fixes, split-note merges, and timing touch-ups in minutes.
Sketching away from the studio
A chord idea on a borrowed laptop, a melody fix during a commute — the editor is wherever a browser is.
Prepping collaboration files
Tidy a rough MIDI before sending it to a co-writer, or inspect a received file without spinning up a full project.
Editing habits that keep MIDI musical
Quantize like seasoning
Full-strength quantization everywhere turns a performance into a typing test. Snap the downbeats, keep the swing, and A/B before committing.
Watch note tails after moving phrases
Dragged passages create overlaps that sound fine on piano and become smears on sustained synths. Sweep for collisions before export.
Version before big surgery
Duplicate the file before restructuring a section. The freedom to experiment ruthlessly comes from knowing the original is one click away.
MIDI editor questions
Do I need an account or installation?
It runs in the browser as part of the workspace — no download, no plugin. Open it, edit, export. Signing in connects it to the rest of your library and the audio-to-MIDI flow.
Will my DAW open the exported files?
Yes — exports are standard MIDI, the one format the entire industry agrees on. Every mainstream DAW, notation app, and most hardware will read them directly.
Can I change what instrument plays the notes?
For playback, yes — audition the part on different sounds to judge it fairly. The MIDI itself stays instrument-agnostic, so the final voicing happens wherever you produce the track.
Is it a replacement for my DAW?
No, and it doesn't try to be. It's the fast lane for note-level work: quicker to open, focused on editing, and honest about handing off to your DAW when the session grows.
Edit the notes where you are
No installs, no project files, no waiting. Open the piano roll, fix the music, export, done.
Open the editor