Mermaid Diagram Viewer

Paste your Mermaid code (flowchart, sequence, class, Sankey, and more) and this interactive renders it live, with pan, zoom, and a fullscreen mode so learners can explore large or complex diagrams comfortably. Choose from 8 built-in themes, add an optional legend, and customize colors, fonts, and frame styling — all without touching code. Keyboard, mouse, and touch controls are fully supported, with screen reader accessibility built in.