UML diagram tool

Lucidchart is an intelligent diagramming application that combines diagramming, data visualization, and collaboration to accelerate understanding and drive innovation.

Make a UML diagram
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UML diagram tool

It’s never been easier to make a UML online

  • UML software

    UML software used by developers and technical professionals

    A unified modeling language (UML) diagram depicts a system and how users or other systems interact with yours—a system could be a website, an app, or maybe a business process. Create a class diagram online to navigate source code, plan new features, and demonstrate the basic flows and tasks within your system. Visualize the high-level current and future state of your product with a UML graph to ensure productive Agile environments for software developers, engineers, data scientists, and other technical professionals.

  • UML diagram maker with sequence markup

    Save time with UML sequence markup

    Our UML diagram maker and sequence markup editor make it faster and easier to understand complexities in code by automating the process of generating a class diagram. Simply build and customize sequence diagrams online from text. Upon entering your markup in the pop-up dialog, Lucidchart will automatically generate a sequence diagram that follows PlantUML standards. Otherwise, you can select and customize a UML template from the template gallery, then easily rearrange symbols and shapes to reflect the structure of your system using our UML model tool.

  • Industry standard UML shapes

    Standardize your diagrams with our UML shape libraries

    When you enable the UML shapes library, you’ll have instant access to industry-standard UML shapes. Unlike other UML software, Lucidchart doesn’t limit or constrain your ideas. Whether you are building UML component, class, deployment, object, or package diagrams, simply drag and drop shapes on to your canvas without worrying about running out of space. Then, show external interactions by placing primary and secondary actors on your canvas, such as customers or data, and draw lines to connect them to each use case. 

  • Collaborative UML diagram tool

    Explore the benefits of collaboration and documentation

    Documentation plays a critical role in the long-term health and sustainability of your system or application. Creating UML diagrams with Lucidchart speeds up onboarding, reduces the number of meetings you schedule, and helps teams communicate ideas quickly in an Agile environment. Our UML diagram tool facilitates the design and documentation processes but also improves how you collect, review, and implement feedback from stakeholders or potential users. Lucidchart is built for real-time collaboration, helping you refine your UML diagrams online with colleagues, whether they use Mac, PC, or Linux. 

  • Share UML diagrams online

    Present and share your UML diagrams

    Your system may be complicated, but sharing doesn’t have to be. Customize sharing permissions in Lucidchart and easily invite your colleagues or stakeholders to view your diagram, all without worrying about unwanted edits. Share your document via email or URL, or export your diagram to Jira, Confluence, Slack, or Microsoft Teams. You can also leverage the simple power of Lucidchart presentation mode—present your entire diagram or fill your presentation with focused sections of your diagram for a deeper look at your system.

How to create UML diagrams online in Lucidchart

  1. Add or import shapes

    Import customized UML shapes or enable our industry-standard UML shapes by pressing the M key to open the shape manager.

  2. Automate the process by using sequence markup

    Speed up the process of creating your UML diagram. In our UML creator, under the “UML sequence” category in the toolbar, click “Use markup,” type your markup, and click “Build.”

  3. Identify and add components

    Drag and drop shapes onto your blank canvas that reflect the UML diagram type you need to create. Connect shapes using arrows to indicate relationships and flows.

  4. Add text and concepts to your UML diagram

    Label and arrange your use cases, flows, and actors to clearly communicate the purpose and optimize the requirements of your system.

  5. Publish, implement, and share

    Share your UML diagram with other teams or stakeholders. Embed your diagram in a wiki, send via email, or include in popular app integrations like Jira, Confluence, and Slack.

Create a UML diagram

Frequently asked questions about UML diagrams

Why choose Lucidchart as your UML diagram maker

Used by millions across the globe

"I had to draw diagrams related to my project, such as UML diagrams, class diagrams, activity diagrams, and sequential diagrams. The ease with which I was able to draw them was amazing!"

Capterra rating

4.5/5 stars 650+ reviews

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Browse UML templates

UML Class Diagram Template

Class Diagram Template

See why 99% of Fortune 500 companies securely scale their enterprises with Lucidchart

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