UML Diagram Tool

You wouldn't build a house without a blueprint, right? The same should go for building UML software. Use Lucidchart to create free online UML diagrams that are clean and efficient.

96% of the Fortune 500 choose Lucidchart.

Raytheon
BP
McKinsey
Loreal
Barclays
BMW

UML Shape Library

Draw state diagrams, activity diagrams, use case diagrams, and more. With an extensive shape and connector library, you'll find everything you need.

Make a UML diagram