Sequence Diagram Generator Sequence Diagrams
Describe an interaction and get a clean, labeled UML sequence diagram in seconds, complete with vertical lifelines, horizontal message arrows, activation bars, and loop or alt fragments. Document software flows without touching a diagramming tool.
Sequence Diagram Generator
Your sequence diagram will appear here
Describe your flow and click Generate
Sequence Diagram Examples
Browse sequence diagrams made with Figviz, or generate your own above
User Login Authentication
A login flow showing the User, Browser, Auth Server, and Database exchanging credentials and returning a JWT token.
Online Payment Checkout
A checkout sequence covering the Customer, Frontend, Payment Gateway, and Order Service with confirmation steps.
API Request-Response
A REST API call chain from Client through API Gateway to Microservice and back, with status codes labeled.
E-Commerce Order Placement
An order placement flow across Customer, Cart Service, Inventory Service, and Shipping Service.
Loop and Alt Fragments
A sequence demonstrating loop and alt combined fragments for retry logic and conditional branching.
Simple Two-Actor Sequence
A clean two-actor sequence diagram showing the core UML elements: lifelines, messages, and activation bars.
What is a sequence diagram generator?
A sequence diagram generator is a tool that turns a written description of an interaction into a formal UML sequence diagram. You describe the actors (people, services, or systems) and the messages they exchange, and the tool draws the vertical lifelines, horizontal arrows, and activation bars that make the flow readable at a glance. Figviz uses AI to interpret plain language, so you can describe a login flow, an API call chain, or a checkout process without writing any diagram syntax. The result is a clean, export-ready diagram in seconds.
How to make a sequence diagram
Sequence diagram elements: lifelines, messages, activation bars, and fragments
Tips for clear sequence diagrams
Keep actor names short and consistent between the description and the diagram. Always write messages in chronological order top to bottom, the way a reader follows the diagram. Specify return values explicitly (for example "returns 200 OK with JSON") so the dashed arrow gets a useful label rather than a generic one. If a section repeats or branches, name the fragment type (loop, alt) and its condition in your prompt. For large flows, break them into sub-flows and generate one diagram per scenario rather than one giant diagram that is hard to read.
Sequence diagrams in software documentation
Sequence diagrams are a standard part of software design docs, API references, and architecture decision records. They communicate the runtime behavior of a system in a way that static class diagrams cannot: you can see the order of calls, who is waiting on whom, and where the critical path runs. Figviz lets you generate a diagram directly from a plain prose description of a feature, which makes it easy to keep docs in sync with the system as it evolves. Export at 4K resolution for crisp rendering in Confluence, Notion, Figma, or printed runbooks.
Frequently asked questions
Related software diagram tools
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