How do I use the Mermaid Diagram Editor?

Enter Mermaid syntax in the editor, and see a live preview instantly. You can use templates for flowcharts, sequence diagrams, Gantt charts, class diagrams, and more. Export as SVG or PNG.

Is the Mermaid Diagram Editor free to use?

Yes, this tool is completely free with no signup required. Everything runs locally in your browser for speed and privacy.

Does the Mermaid Diagram Editor work on mobile devices?

Yes, the tool is fully responsive and works on any device with a modern browser. All processing runs locally.

Mermaid Diagram Editor - Flowcharts & Sequence Diagrams

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📝 Mermaid Code

👁️ Live Preview

Mermaid Syntax Quick Reference

Flowchart (flowchart)

flowchart TD - Top to bottom; LR - Left to right
A[rectangle] --> B(rounded) --> C{diamond}
Connectors: --> solid, -.-> dotted, ==> thick

Sequence Diagram (sequenceDiagram)

Alice->>Bob: message - solid head
Alice-->>Bob: message - dotted head

Gantt Chart (gantt)

dateFormat YYYY-MM-DD set date format
section phase separate sections

Free Online Mermaid Diagram Editor - Flowcharts & Sequence Diagrams