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Mermaid Diagram Viewer

Render diagrams from Mermaid.js syntax — the same format AI tools like ChatGPT, Claude & Copilot use natively

🤖 AI Diagram TipsPaste ChatGPT/Claude Mermaid output directlyAsk AI: "draw a flowchart using mermaid"Ask AI: "create an ER diagram in mermaid syntax"100% client-side

Mermaid Code

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Diagram preview will appear here...

About the Mermaid Viewer

ChatGPT, Claude, Copilot and every serious AI assistant now emit diagrams as Mermaid code - but pasting ```mermaid blocks into a chat gives you no way to actually view, fix, or export the diagram. "How do I view mermaid diagrams" is the natural next question.

Paste any Mermaid code to render flowcharts, sequence diagrams, ER models, and Gantt charts instantly. Debug syntax errors with inline messages, iterate on the source in the editor, and export the result. Rendering is 100% client-side.

How to use

  1. Copy the Mermaid code your AI assistant or teammate produced.
  2. Paste it into the editor - the diagram renders immediately.
  3. Fix any syntax errors using the inline error messages.
  4. Export or screenshot the diagram for docs and presentations.

Frequently Asked Questions

How do I view mermaid diagrams from ChatGPT or Claude? ▾

Copy the mermaid code block the assistant produced, paste it into the editor here, and the diagram renders instantly. No plugins or local installs needed.

Which diagram types are supported? ▾

The full Mermaid set: flowcharts, sequence diagrams, ER diagrams, class diagrams, state diagrams, Gantt charts, pie charts, and mind maps.

Can I fix errors in generated diagrams? ▾

Yes - syntax errors are shown inline with the line number. AI assistants frequently produce small mistakes like unquoted labels; edit the source until the diagram renders, then export.