Mermaid Diagram

Mermaid is a JavaScript-based diagramming and charting tool that renders Markdown-inspired text definitions to create and modify diagrams dynamically.

You can build flowcharts, sequence diagrams, class diagrams, state diagrams, entity-relationship diagrams, Gantt charts, and many more.

We use a secure backend proxy that connects to the open-source Kroki engine. Your code is processed temporarily for rendering and is never stored permanently.

Yes! Once rendered, you can download the diagram as a high-quality, infinitely scalable SVG file by clicking the download button.

Mermaid allows you to apply themes and custom CSS directly within the syntax. You can define class styles and apply them to specific nodes.

Yes, the MERMAID DIAGRAM tool is completely free with no usage limits, sign-ups, or subscriptions required.

No. We do not store or log any of the diagrams you generate.