PlantUML Sequence Diagram Editor - Create Interactive Sequence Diagrams Online
Design professional sequence diagrams with our free PlantUML editor. AI-powered generation, real-time preview, and instant export to PNG, SVG, PDF. Perfect for software architecture and system design.
Real-time preview will be shown here
💡 Pro tip: Use 'activate' and 'deactivate' to show object lifelines
Why Choose Our Sequence Diagram Editor?
Professional sequence diagram creation made simple with advanced features and AI assistance.
Real-time Preview
See your sequence diagram update instantly as you type. No need to refresh or compile.
AI-Powered Generation
Describe your system flow in plain English and let AI generate the PlantUML code for you.
Advanced Sequence Features
Support for activation boxes, notes, loops, alternatives, and parallel processing.
Multiple Export Formats
Export your diagrams as PNG, SVG, or PDF. Perfect for documentation and presentations.
Collaboration Ready
Share your diagrams with team members via direct links or embed in documentation.
Template Library
Start with pre-built templates for common patterns like authentication, API calls, and more.
Sequence Diagram FAQ
Common questions about creating sequence diagrams with PlantUML
What is a sequence diagram?
A sequence diagram shows how objects interact with each other over time. It displays the sequence of messages exchanged between different components in a system, making it perfect for documenting APIs, user flows, and system interactions.
How do I create activation boxes in PlantUML?
Use 'activate' and 'deactivate' keywords to show when an object is active. For example: 'activate User' followed by 'deactivate User' will show the object's lifeline as active during that period.
Can I add notes to my sequence diagram?
Yes! Use 'note left of', 'note right of', or 'note over' to add explanatory notes to your diagram. For example: 'note right of User: This is a note'.
How do I show alternative flows?
Use 'alt', 'else', and 'end' keywords to show alternative scenarios. This is perfect for showing success and error cases in your sequence flows.
Is this sequence diagram editor free?
Yes! Our basic sequence diagram editor is completely free. You can create, edit, and export sequence diagrams without any cost. Premium features include advanced AI assistance and collaboration tools.
Ready to Create Professional Sequence Diagrams?
Join thousands of developers and architects who use our PlantUML editor for their sequence diagrams.