Mermaid Live Editor
Write Mermaid diagrams, preview common flowcharts, and prepare diagrams for docs.
What Mermaid Syntax Is
Mermaid is a text-based diagram language used in engineering docs, pull requests, architecture notes, runbooks, and wikis. Instead of drawing boxes manually, you write a short description of the diagram and let the documentation renderer turn it into a visual chart.
How To Use This Mermaid Editor
Paste or write Mermaid code in the editor, review the flowchart preview, then copy the source into your Markdown file, docs system, or issue comment. The preview intentionally supports the common flowchart pattern most teams use for process maps, dependency diagrams, and architecture sketches.
Common Diagram Types
- Flowcharts: Show steps, decisions, and system relationships.
- Sequence diagrams: Explain API calls and service interactions over time.
- Class diagrams: Document object models and important relationships.
- State diagrams: Clarify lifecycle states and transitions.
- Gantt charts: Outline project timelines and delivery dependencies.
Mermaid In Engineering Docs
Mermaid works especially well when diagrams need to live close to code. A text diagram can be reviewed in a diff, versioned with the document, and updated in the same pull request as the architecture or workflow it describes. That makes it useful for API flows, incident reviews, deployment plans, database migration notes, and onboarding material.
FAQ
- Does this Mermaid editor render every Mermaid diagram type?
- The browser preview focuses on common flowchart arrows so the page stays fast and dependency-free. You can still write any Mermaid syntax and copy it into documentation systems that support Mermaid.
- Can I use Mermaid diagrams in Markdown files?
- Yes. Many documentation tools, wikis, and repository viewers support Mermaid code fences in Markdown. Paste the diagram code into a mermaid fenced block.
- Is my diagram uploaded anywhere?
- No. The editor runs in your browser and does not send diagram text to a server.