#mmd

Mermaid NG — Visual Editor

NGPowerToys

WYSIWYG, drag-and-drop visual editor for AI-friendly Mermaid diagrams — what you see is what you get. For architects and developers — build, edit, and round-trip flowcharts, sequence, class, ER, and state diagrams across .md and .mmd files. Multi-sheet (draw.io style), fully offline (Mermaid 11.15.0

Mermaid Preview — 100% Offline

brainfkt

Offline-first Mermaid diagram preview for VS Code—with professional export, no account, and no required network connection.

Mermaid Lint

mermaid-lint

Live Mermaid diagram validation — inline squiggles, hover, and quick-fixes in Markdown fenced blocks (.md, .markdown) and standalone .mmd files.