Mermaid Diagram Editor Online

The fastest free online Mermaid.js editor — live preview, AI generation, SVG & PNG export.

What is Mermaid.js?

Mermaid.js is an open-source, JavaScript-based diagramming tool that lets you create diagrams using simple text-based syntax. It is natively supported in GitHub, GitLab, Notion, and Confluence.

Why AnyDiagram is the Best Mermaid Editor Online

• Live Preview: See your Mermaid diagram render in real-time as you type.
• Error Highlighting: Syntax errors are caught and displayed inline.
• AI Generation: Describe your diagram and let AI write the Mermaid code for you.
• SVG & PNG Export: Export your finished diagram as a crisp vector SVG or high-resolution PNG.
• Saved Diagrams: Sign in with Google to save and manage all your diagrams.

Mermaid Syntax Quick Reference

Flowchart: flowchart TD — Sequence: sequenceDiagram — ER: erDiagram — Class: classDiagram — State: stateDiagram-v2 — Gantt: gantt — Mindmap: mindmap