UMLGen

UMLGen is a browser-based diagramming tool that turns plain-English system descriptions into UML, ER, or EER diagrams. Its engine parses the text, identifies relationships, and renders the selected notation without requiring special syntax. Supported diagram types are Use Case, Class, Sequence, Activity, Deployment, ER, and EER. You can revise a generated diagram by changing its description and regenerating it, or create one from scratch in the editor. Finished diagrams download as high-resolution PNG images. UMLGen runs on desktop, tablet, and mobile browsers, with no installation, plugin, IDE, or signup required. The core diagramming features are described as free forever, with no export limits. The Free plan costs nothing and includes text-to-diagram generation, the design-from-scratch editor, and PNG export. The site names software developers, students and academics, and software architects as intended users.

UMLGen focuses on text-to-diagram creation while also providing a manual editor. Its free browser access and broad listed diagram support make it suitable for straightforward modeling work.

UMLGen suits developers, students, academics, and software architects who need browser-based UML or data-model diagrams. It also fits users who want text-driven creation without installing software or creating an account.