CAP_01 Piano-roll editing
Draw, move, resize, copy, quantize and transpose individual MIDI notes.
MIDI editor / Live
Online MIDI Editor — Edit Notes & Tracks in Your Browser
A full piano-roll and arrangement editor for standard MIDI files. Make precise changes, audition instantly, and download the result without creating an account.
Capability map
What the online MIDI editor does
CAP_02 Track arrangement
Organize multi-track songs, instruments, channels, mute states and routing.
CAP_03 Tempo and controls
Edit tempo changes, velocity, pitch bend and controller events with visual tools.
Workflow
Edit MIDI files online in three steps
STEP_01 Open a MIDI file
Choose a local .mid or .midi file, or begin with a blank song.
STEP_02 Edit in the browser
Use the piano roll, arrangement view and tempo graph to reshape the performance.
STEP_03 Save or render
Download edited MIDI, or export the current sound as WAV or MP3.
№ 03 — Guide
How to Edit a MIDI File in Your Browser
- Open a song or start blank. Choose a local .mid or .midi file, or create an empty song when you want to build an arrangement from scratch.
- Shape notes in the piano roll. Draw, select, move, resize, copy, quantize or transpose notes while inspecting pitch and timing against the grid.
- Refine the performance. Organize tracks, assign General MIDI instruments, and edit tempo, velocity, pitch-bend and controller events where needed.
- Listen before saving. Use SoundFont playback to audition the current arrangement and catch timing, balance or instrument issues.
- Choose the useful output. Save a standard MIDI file when you need editable note data, or render MP3 or WAV when you need audio playback.
№ 04 — Use cases
When a Browser MIDI Editor Fits
A browser editor is useful for focused changes: correcting notes, reorganizing tracks, adjusting tempo events, testing instruments or preparing a file for audio export. Because the normal workflow reads the MIDI locally, you do not need to send an unfinished composition to Miditor.
A full desktop DAW remains the better choice for recording audio, hosting plug-ins, advanced automation or detailed mixing. Miditor is designed for direct MIDI inspection and editing when installing a larger production environment would add unnecessary friction.
Editing tools available
- Piano-roll note drawing, movement, resizing, copying, quantization and transposition
- Arrangement, track, channel, instrument, mute and solo controls
- Tempo, velocity, pitch-bend and controller-event editing
- Standard MIDI download plus MP3 and WAV rendering
MIDI editor FAQ
Online MIDI editor questions
Do my MIDI files leave my device?
No. The MIDI editor parses and edits local files in your browser. Your file is not uploaded to Miditor during the normal editing workflow.
Can I edit notes and tracks in the browser?
Yes. Open a MIDI file to use the piano roll, arrangement view, tempo editor, track controls and event tools without installing desktop software.
Can I create a blank MIDI file?
Yes. Choose Create blank MIDI on the editor start screen, then add tracks and notes directly in the piano roll.
Is there a fixed MIDI file-size limit?
Miditor does not set a published file-size limit. Practical capacity depends on the file's complexity, your browser and the memory available on your device.
Can other music software open the saved MIDI?
The editor downloads a standard MIDI file. Most DAWs and notation applications can open it, although instrument mapping and less common events may be interpreted differently by each application.