Online MIDI Editor

Edit MIDI files directly in your browser. View notes on a piano roll, adjust pitch and timing, change instruments, modify velocity, and export your edited MIDI. Free online MIDI editor with no software to install.

Try MIDI Tools Free
Learn How It Works

Listen to MIDI Audio Examples

Hear what MIDI-based music production sounds like. Click play to preview.

MIDI Piano Demo

0:00 / 0:00

Piano melody created from MIDI data

How the Online MIDI Editor Works

The online MIDI editor is a browser-based tool for viewing and editing MIDI files without installing any software. MIDI (Musical Instrument Digital Interface) is a standard protocol that stores musical information as data rather than audio. A MIDI file contains note events that specify which notes to play, when to play them, how long to hold them, and how hard to strike them. The MIDI editor displays this data visually on a piano roll, where each note appears as a colored block on a grid.

When you open a MIDI file in the editor, you see every note laid out on a timeline. The horizontal axis represents time, and the vertical axis represents pitch. You can click on any note to select it, then drag it to change its position in time or pitch. Stretch a note to make it longer or shorter. Adjust velocity (how hard the note is struck) to control dynamics. Add new notes by clicking on empty spaces in the piano roll. Delete notes you do not want. The editor gives you complete control over every aspect of the MIDI data.

MIDI editing is fundamental to modern music production. Producers use MIDI editors to compose melodies, build chord progressions, program drum patterns, and arrange multi-track compositions. Because MIDI stores note data rather than audio, you can change instruments, adjust tempo, transpose keys, and modify arrangements without any loss of quality. A piano melody can become a string ensemble, a guitar riff, or a synth lead with a single instrument change.

The online MIDI editor supports standard MIDI file formats including Type 0 (single track) and Type 1 (multi-track). You can edit individual tracks in multi-track files, mute or solo specific tracks, and adjust the mix of instruments. The editor displays track names, instrument assignments, tempo markings, and time signature changes.

Professional MIDI editing features include quantization (snapping notes to a grid for tighter timing), velocity scaling (adjusting the dynamic range of a passage), note transposition (shifting all notes up or down by a set interval), and tempo adjustment. These tools help you refine your MIDI compositions to professional standards without needing expensive desktop software.

The online MIDI editor is completely free to use. There is no account required for basic editing. Upload your MIDI file, make your changes, and download the edited file. For advanced features like AI-powered MIDI generation from audio, check out our Audio to MIDI tool that converts audio recordings into editable MIDI data.

Edit MIDI in Three Steps

From file upload to edited MIDI in minutes. The online editor handles visualization, editing, and export.

1

Upload Your MIDI File

Upload a standard MIDI file (.mid or .midi) from your computer. The editor supports Type 0 and Type 1 MIDI files with multiple tracks and instruments.

2

Edit in the Piano Roll

View and edit notes on the visual piano roll. Drag notes to change pitch or timing. Adjust velocity, add new notes, delete unwanted notes, and modify instrument assignments.

3

Export Your Edited MIDI

Download the edited MIDI file to your computer. Use it in your DAW, share it with collaborators, or load it into other music software for further production.

MIDI Editor Features

Everything you need to edit MIDI files online, free and without any software installation.

Visual Piano Roll

See every note displayed on a piano roll grid. Click and drag to edit pitch, timing, duration, and velocity. The visual interface makes MIDI editing intuitive.

Multi-Track Support

Edit multi-track MIDI files with separate instrument tracks. Mute, solo, and adjust individual tracks independently.

Note Quantization

Snap notes to a grid for tighter timing. Choose quantization values from whole notes to 32nd notes. Fix timing imperfections with one click.

Velocity Editing

Adjust note velocity to control dynamics. Make passages louder or softer. Create crescendos and decrescendos by scaling velocity values.

Instrument Changes

Assign different instruments to MIDI tracks. Change a piano to strings, guitar, synth, or any General MIDI instrument without re-recording.

No Installation Required

The MIDI editor runs entirely in your browser. No downloads, no plugins, no sign-up for basic editing. Upload, edit, and export on any device.

Who Uses the Online MIDI Editor

Music producers, composers, students, and hobbyists edit MIDI files for composition, arrangement, and production.

Music Producers

Edit MIDI patterns for beats, melodies, and arrangements. Quantize notes, adjust velocities, and prepare MIDI files for DAW import.

Composers

Compose and arrange music using the piano roll. Write melodies, build chord progressions, and create multi-instrument arrangements visually.

Music Students

Study music theory by visualizing MIDI data. See chord structures, scale patterns, and rhythmic relationships on the piano roll.

DJs and Remixers

Edit MIDI data from sampled recordings. Modify melodies, change keys, and adjust arrangements for remixes and mashups.

Game Developers

Edit MIDI soundtracks for games. Adjust tempo, change instruments, and modify compositions for different game levels and scenes.

Hobbyists

Explore MIDI files from the web. Edit your favorite songs, learn how they are structured, and experiment with different arrangements.

MIDI Editor FAQ

Common questions about editing MIDI files online.

Start Editing MIDI Files Online

Upload your MIDI file and edit it in your browser. Change notes, adjust timing, swap instruments, and export the finished file. Free with no software to install.