Online Music Editor

The Online Music Editor provides a browser-based canvas to compose and modify musical notation without desktop software. It supports notes, rests, chords, tempo, key and time signatures, and instrument mapping. Users can input notes via a piano-roll-like grid or selectable note tools, adjust durations, and transpose in real time. Core features include import/export in MIDI and MusicXML, playback with on-screen cursor, and export of PDF/PNG scores when needed. The tool aligns with Western notation conventions and standard MIDI mapping, making it suitable for composers, educators, and students who want quick score iteration. Conceptually, it separates notation data (pitch, duration, timing) from rendering, so logic remains consistent when exporting or mutating the score. The engine validates rhythm integrity, prevents overlapping notes where appropriate, and supports multiple voices and instruments for flexible arrangements. Unique value comes from a fast, dependency-free rendering pipeline, keyboard shortcuts for rapid editing, and robust input validation. Typical use cases include drafting melodies, arranging short scores for teaching, producing practice materials, and exporting ready-to-print parts.