Online MIDI Editor

The Online MIDI Editor provides a browser-based workspace to assemble and refine MIDI sequences without desktop installations. It supports multi-track composition, tempo and time signature control, and direct MIDI export for use in DAWs or hardware devices. Conceptually, user actions map to a structured timeline of MIDI events that the engine encodes as standard MIDI messages. Playback uses the Web Audio API to audition edits in real time while maintaining precise timing. The tool is designed for musicians, educators, and hobbyists who need quick prototypes, classroom demonstrations, or collaborative editing, with a focus on clarity, speed, and interoperability. Unique value lies in zero-install convenience, immediate export options, and an intuitive grid-based workflow that scales from simple melodies to layered arrangements. Core features include track management, note input and editing, velocity control, loop regions, and import/export of .mid files; advanced users can leverage swing presets and quantization to align performances. Use cases range from lesson demonstrations and practice drills to rapid song drafting and project sharing with collaborators across platforms.