Question 1

Why do I get 'No diagram type detected'?

Accepted Answer

You likely pasted PlantUML while 'Mermaid' was selected (or vice versa). Use Auto detect or pick the correct type from the dropdown.

Question 2

Mermaid shows a parse error near parentheses

Accepted Answer

Quote labels containing parentheses, e.g., F["Frontend (React)"] or ensure each statement ends with a newline or semicolon. The tool auto-quotes common cases.

Question 3

Is my diagram sent to a server?

Accepted Answer

Mermaid diagrams render locally in your browser. PlantUML diagrams are compressed and requested from the public PlantUML server to render the image.

Mermaid & PlantUML Diagram Generator