Is my diagram private?

Source is sent to plantuml.com for rendering. Do not paste secrets.

Recommended. Wrap diagrams with @startuml and @enduml for best results.

Can I use offline rendering?

Not in this tool yet. Mermaid and Graphviz run fully in-browser.

Write PlantUML text and preview UML diagrams. Rendering uses the public PlantUML service.

PlantUML source

Preview is generated via plantuml.com (source is sent to their server).

Preview

Enter PlantUML source, click Render. Your text is encoded and requested from plantuml.com to generate the image.

Is my diagram private?: Source is sent to plantuml.com for rendering. Do not paste secrets.
Do I need @startuml?: Recommended. Wrap diagrams with @startuml and @enduml for best results.
Can I use offline rendering?: Not in this tool yet. Mermaid and Graphviz run fully in-browser.