What Is Mermaid?
Mermaid is a JavaScript-based diagramming and charting tool that renders Markdown-inspired text definitions to create and modify diagrams dynamically. It supports flowcharts, sequence diagrams, class diagrams, state diagrams, Gantt charts, pie charts, ER diagrams, and mind maps. Mermaid is widely used in documentation, README files, and technical wikis.
How to Use This Mermaid Editor
- 1Type or paste Mermaid syntax in the editor panel on the left.
- 2The diagram preview updates automatically as you type.
- 3Choose a theme (default, dark, forest, neutral) to change the diagram style.
- 4Click sample buttons to load example diagrams for different chart types.
- 5Export your diagram as SVG (vector) or PNG (raster) using the export buttons.
Common Use Cases
Create Architecture Diagrams
Quickly sketch system architecture, data flow, or deployment diagrams using simple text syntax.
Generate Sequence Diagrams
Document API interactions, authentication flows, or microservice communication patterns.
Project Planning with Gantt Charts
Visualize project timelines, task dependencies, and milestones.
Frequently asked questions
Does this tool work offline?
Yes. Once the page is loaded, all diagram rendering happens in your browser. No internet connection is needed for subsequent edits.
What diagram types are supported?
Flowcharts, sequence diagrams, class diagrams, state diagrams, Gantt charts, pie charts, ER diagrams, mind maps, and more. See the Mermaid documentation for the complete list.