Free ZenUML Sequence Diagram Maker Online
Free ZenUML Sequence Diagram Maker Online
Write sequence diagrams with intuitive, code-like ZenUML syntax for clearer system interactions.
What is a ZenUML Diagram?
ZenUML is an alternative syntax for creating sequence diagrams that uses a code-like, developer-friendly format. Instead of arrow-based notation, ZenUML uses method calls and curly braces to represent interactions, making it more natural for programmers. It supports the same concepts as traditional sequence diagrams but with a syntax that feels like writing code.
Common Use Cases
- •API documentation - Document service interactions with code-like syntax
- •Developer communication - Express sequence logic in familiar programming style
- •Microservice interactions - Show service-to-service method calls
- •Code review - Visualize complex call chains before implementation
- •Technical specifications - Define interaction contracts between services
Syntax Quick Reference
| Element | Syntax | Description |
|---|---|---|
| Title | title Name | Diagram heading |
| Participant | @Actor Name | Define an actor or participant |
| Method call | A->B.method(args) | Synchronous call |
| Nested call | { ... } | Calls within a method scope |
| Return | return value | Return from a method call |
| Stereotype | @Boundary, @Entity | Participant type annotation |
Export Options
PNG Export
High-resolution images for documents and presentations.
SVG Export
Scalable vectors for web and further editing.
PDF Export
Print-ready format for professional documentation.
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Free Mermaid Syntax Cheat Sheet
All 21 diagram types in one PDF reference.
Frequently Asked Questions
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