Free Online UML
Diagram Maker

Create UML Diagrams in minutes using the intuitive MockFlow online UML Diagram maker for free.

Create UML Diagram

Easiest way to draw UML Diagrams

UML Class Diagrams

UML Activity Diagrams

UML Sequence Diagrams

UML Use Case Diagrams & more

Built-in shape library

Build professional UML diagrams in less time using the built-in UML components shape library which has you covered for all types of UML diagrams.

Perfect for Software Development teams

The UML Diagram tool from MockFlow is an easy-to-use tool ideal for both technical members like developers, data scientists, software engineers as well as non-technical members such as managers and other stakeholders to collaborate and create the perfect structural or behavioural modelling diagrams.

Collaborate & Share UML Diagrams easily

Export your UML Diagrams into images and share offline or share with a public link with one click.

You can also bring your team members to MockFlow and build the UML diagrams together collaboratively.

Collaborate and Share UML Diagrams easily

Create UML Diagrams Offline with MockFlow Desktop App

MockFlow offers a desktop app for both Windows and MacOS platforms for increased productivity and efficiency. You can create and store UML diagrams locally with the offline mode.