Fully Open-sourced Online MIDI Editor

Start making music without installing anything

Supported desktop browsers: Google Chrome / Firefox / Safari

Features

Open/Save MIDI Files
Built-in GM compatible virtual sound module
Piano Roll Editor
Multi track editing
Velocity, pitchbend editing
Tempo Track
Non 4/4 Time Signature (display only)

Support

signal is an app that I personally make as a hobby. Please forgive all kinds of bugs. If you agree with the concept of lightweight composer software that runs in a browser, please support me. I would be grateful if you could report bugs, recommend to others, and sponsorship.

Report bugs on GitHub

Request features on GitHub

Bug Report/Feature Request on Google Forms

Become a sponsor