Use Case Diagram Generator for Software Requirements

What should you enter?

• System boundary: the product, application, service, or subsystem being modeled.
• Actors: people, roles, external systems, or services that interact with the system.
• Use cases: goal-oriented actions such as Checkout, Borrow Book, Transfer Funds, or Generate Report.
• Associations: actor-to-use-case links using syntax like Customer -> Checkout.
• Include and extend relationships when one use case always reuses another or conditionally adds behavior.

Why this is not a generic diagram tool

Use case diagrams have strict notation. A flowchart or general AI image may look polished but still put actors inside the system boundary, overuse include arrows, or describe implementation steps instead of user goals. This generator focuses only on UML use case structure so the result is easier to review in software requirements documents.

How to model include and extend

• Use include when a base use case always requires another use case, such as Checkout including Process Payment.
• Use extend when optional or conditional behavior adds to a base use case, such as Apply Coupon extending Checkout.
• Keep the diagram high level. Use a sequence diagram or activity diagram for detailed step-by-step behavior.
• Use PlantUML export when you want a version-controlled text representation of the diagram.

When should you use it?

• Software requirements documents and SRS assignments.
• Product discovery workshops where roles and goals need to be clarified quickly.
• System analysis classes that require standard UML notation.
• Engineering documentation before writing sequence diagrams, class diagrams, or API specifications.