Online UML Diagram Tool

Connect Your Code Repository

You can point SmartDraw at your repository or load your source code and choose which files you want to include in your diagram. Learn more about SmartDraw's class diagram builder.

Pick a Template

SmartDraw has every type of UML diagram your team needs to design and document systems. Select the type of visual you need, whether structural or behavioral, and all the relevant tools and symbols will be docked next to your work area.

Add Shapes

Drag and drop your first symbol to the drawing. Once you already have a shape, you can add new ones by drawing a line and choosing a symbol from the auto-prompt that appears.

This menu is pre-populated with the most common symbols for the selected diagram type. The options will change over time to symbols you use, so you'll always have what you need at your fingertips.

Define Relationships

Most UML diagrams involve connecting one or more shapes to each other using lines with special symbols or arrowheads to indicate relationships like aggregation, dependency, inheritence, composition, and association for classes and interface type for components. SmartDraw has a context sensitive line style menu for the type of UML diagram you're making to make defining relationships easy.

Define Multiplicity

Some UML diagrams like class diagrams often use a multiplicity notation to indicate the number of instances of one class linked to one instance of the other class. SmartDraw makes adding multiplicity easy by another context sensitive meny that lets you define them in just a few clicks.

Add Text

Make sure you add labels to all your classes, use cases, and actors at the level of detail appropriate for your audience. Not all stakeholders will need the visual to be super technical to be able to give feedback about the system.