Is my diagram sent to a server?

Rendering uses the Mermaid library in your browser. Nothing is uploaded.

Which diagram types are supported?

Flowcharts, sequence, class, state, ER, Gantt, pie, and other Mermaid diagram types.

Check syntax against Mermaid docs. Some experimental features need a recent Mermaid version.

Write Mermaid syntax and preview flowcharts, sequence diagrams, class diagrams, and more in your browser.

Mermaid source

Preview

Edit Mermaid code on the left, then click Render (or use the sample). The diagram updates on the right.

Is my diagram sent to a server?: Rendering uses the Mermaid library in your browser. Nothing is uploaded.
Which diagram types are supported?: Flowcharts, sequence, class, state, ER, Gantt, pie, and other Mermaid diagram types.
Why does rendering fail?: Check syntax against Mermaid docs. Some experimental features need a recent Mermaid version.