Mermaid Diagram Generator

📖 How to Use

Mermaid is a text-based diagram description language. Write diagrams like code. This tool runs entirely in your browser - your code never leaves your device.

Quick Start: Click a template tab above to choose a diagram type, modify the code, then click Render.

Flowchart Syntax Example

graph TD
    A[Start] --> B{Condition}
    B -->|Yes| C[Process]
    B -->|No| D[Skip]
    C --> E[End]
    D --> E

Sequence Diagram Example

sequenceDiagram
    participant User
    participant System
    User->>System: Send Request
    System-->>User: Return Response

🎯 Use Cases

• Technical Documentation: Replace manual drawing with text-based diagrams
• System Design: Quickly sketch architecture and flow diagrams for team communication
• Presentations: Export high-quality SVG/PNG for slides and reports
• Markdown Blogging: Embed Mermaid code blocks directly in Markdown

❓ FAQ

What diagram types does Mermaid support?

This tool supports flowcharts (graph), sequence diagrams (sequenceDiagram), class diagrams (classDiagram), state diagrams (stateDiagram-v2), ER diagrams (erDiagram), Gantt charts (gantt), and pie charts (pie).

What export formats are supported?

SVG (editable vector format, infinitely scalable) and PNG (bitmap format, great for documents). SVG exports maintain full graphic quality.

What if my diagram fails to render?

Check your Mermaid syntax. Common issues include incorrect arrow direction symbols, duplicate node IDs, or mismatched brackets. Start with a template and modify gradually. Error messages appear below the code editor.

Is Mermaid different from PlantUML?

Mermaid has simpler, more concise syntax that's easier to learn. It's natively supported in GitHub Markdown. PlantUML is more powerful but has a steeper learning curve. For most common diagrams, Mermaid is the better choice.