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No matter the kind of UML diagram you have in mind, our UML diagram tool can help you get to work on it right away, with autofill features and shape libraries to give you a head start.

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Easy, intuitive UML diagrams

Get to work on your UML diagram in minutes with Lucidchart.

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Versatile diagramming

Lucidchart supports all types of UML diagramming, including both structural and behavioral diagrams. No matter what project you have in mind, you can diagram it with Lucidchart.

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Built-in shape library

Our shape library has what you need for your UML diagrams. With our UML diagram creator, you can make your diagrams look professional and build them with best practices in mind.

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UML sequence markup tool

If you’re building a UML sequence diagram, Lucidchart streamlines the process with our UML markup tool. You can auto-generate a sequence diagram from the text you enter in the sequence markup tool.

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Perfect for developers and their colleagues

UML diagrams are most often built by software developers, software engineers, and data scientists. However, they’re useful for more than internal documentation—share the UML diagrams you build in Lucidchart with stakeholders in non-technical roles to help them understand what’s going on.

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Ready to collaborate, present, and share

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Available anytime, anywhere

Our UML diagram generator is cloud-based, so you can create, save, and collaborate on your UML diagrams from anywhere, no matter what device, browser, or operating system you work from.

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Trusted and beloved

Don’t take our word for it—check out what other people say about Lucidchart. We have thousands of five-star reviews on third-party apps like TrustRadius, Capterra, and G2.

Start a UML diagram in Lucidchart in minutes

  • Create your first document, whether you import it, start from scratch, or use one of our templates.
  • Create professional UML diagrams to visualize complex systems.
  • Save time with our UML sequence markup tool.
  • Use Lucidchart’s UML shape library to access industry-standard UML shapes.
  • Share your UML diagram with your team and start collaborating on it

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UML diagram templates and examples

Use a template from our gallery to get a head start on your UML diagram.

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UML class diagram

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Web sequence diagram

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Activity diagram with swimlanes

Lucidchart integrations

Connect Lucidchart to all your favorite industry-leading apps.

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See why teams choose Lucidchart

Diagram, visualize data, and collaborate all in one platform.

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Collaboration

Use Lucidchart on any device with ease. Lucidchart helps teams collaborate in real time from anywhere in the world. Enhance productivity while working with your team to achieve your goals.

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Clarity

Lucidchart brings clarity to the complex. Intelligent diagramming allows you to quickly visualize projects and processes from start to finish.

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Alignment

Drive alignment with your team by collaborating in the same space. Quickly map out processes and ideas together in real time so that you never miss a beat.

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Better together

The Lucid Visual Collaboration Suite transforms the way you work from ideation to project completion. Brainstorm and plan in Lucidspark then map it out in Lucidchart. Create a living blueprint of your organization.

What is a UML diagram?

Unified modeling language (UML) diagrams describe the structure of a system, the objects within the system, and how they all behave. While you’ll find many types of UML diagrams, they fall into two broad categories: structural diagrams and behavioral diagrams.

How to create a UML diagram

  1. Enable the UML shape library

    Open the shape manager in Lucidchart and select the UML library, which includes all the UML shapes, symbols, and notation.

  2. Use sequence markup to automate the process

    Speed up the process of creating your UML diagram. Under the UML Sequence category in the toolbar, click “Use Markup,” type your markup, and click “Build.”

  3. Identify and add UML components

    Drag and drop shapes onto your blank canvas to start work on your UML diagram. Connect these shapes using arrows to indicate relationships and flows.

  4. Add text to your UML diagram

    Label and arrange your use cases, flows, and actors to clearly communicate their purpose.

  5. Publish and share

    Share your UML diagram with other teams or stakeholders. Embed your diagram in a wiki, send it in an email, or share it with integrations like Jira, Confluence, and Slack.

Frequently asked questions about UML diagrams

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FAQs

What is the best free UML creator? â€ș

Best UML Diagram Software & Tool (Open Source & Online)
NamePlatformLink
👍 EdrawMaxWindows, Mac, Linux, Web and iOSLearn More
Adobe ExpressAndroid, iOS, Windows, Mac, LinuxLearn More
VismeWindows and MacLearn More
CreatelyAndroid, Windows and iOSLearn More
1 more row
Jun 19, 2024

What is the best site for UML diagrams? â€ș

Lucidchart supports all types of UML diagramming, including both structural and behavioral diagrams. No matter what project you have in mind, you can diagram it with Lucidchart.

Does anyone still use UML diagrams? â€ș

Historically, UML has been used to model software systems, but it's not limited to software developers. Today, UML diagrams are also used to manage processes and projects. In this scenario, UML diagrams outline entire workflows and business processes.

Which AI can generate an UML diagram? â€ș

EdrawMax is a versatile diagramming tool that supports the creation of 210+ types of diagrams including all common diagrams like flowcharts, mind maps, org charts, Gantt charts, and diagrams commonly used by coders and engineers like UML diagrams, floor plans, electronic drawings, and process flow diagrams.

Why no one uses UML? â€ș

The UML is Not Sufficient

Each model has its strengths and weaknesses, therefore no single model is sufficient for all of your software development needs. Although the UML is in fact quite robust, the reality is that it isn't sufficient for your modeling needs.

Is PlantUML free? â€ș

PlantUML is free and open source and will always be.

However hosting the service and enhancing the product takes time and money. So PlantUML can occasionally display sponsored or advertising messages. Those messages are usually generated on welcome or error images and never on fonctional diagrams.

What is the most commonly used UML diagram? â€ș

The top three UML diagrams that you should get comfortable with include use case diagrams, class diagrams (if you are a programmer), and sequence diagrams.

Why did UML fail? â€ș

One of the most significant issues with UML lies in the gap between the diagrams it produces and the actual implementation. While UML diagrams offer an abstract representation of software systems, they often fail to capture the intricate details of real-world implementation.

Do software engineers actually use UML? â€ș

The primary users of UML include: 1) Software Developers: Software Developers use UML diagrams to design, model, and communicate the architecture and behaviour of software systems. It helps them visualise complex systems and make informed decisions during the development process.

What is used instead of UML? â€ș

Because it is an extension of UML, SysML and UML share a lot of similarities. But SysML also offers some improvements over UML. SysML reduces some of the software-centric restrictions in UML. This means that your SysML diagrams are more flexible and expressive than UML.

Can ChatGPT create a diagram? â€ș

Create a diagram using the Lucid GPT

Open ChatGPT. Select Lucid from the left-hand panel. Type a prompt that relates to diagramming. Example: “Draw a flowchart about whether I should eat pizza or salad.”

Can GPT 4 generate UML diagrams? â€ș

On average, the model was able to generate source code for 88% of the elements shown in the diagrams. Our results indicate that GPT-4-Vision exhibits proficiency in handling single-class UML diagrams, successfully transforming them into syntactically correct class files.

What is the best AI tool to create diagrams? â€ș

yEd Live and Draw.io are good for simple process diagrams, while DiagramGPT is best for creating technical deployment diagrams. ChatUML is useful but may require payment for complex tasks. Whimsical AI is user-friendly and quick.

Is UML lab free? â€ș

Students, teachers, professors and other academic users should have access to new, innovative technologies. That's why we offer free software licenses to educational and research institutions.

Which UML is most used? â€ș

The UML diagrams that are most commonly used are Class Diagrams, Sequence Diagrams, and Use Case Diagrams. These diagrams are essential in software development for visualizing and communicating different aspects of a system's design and behavior.

What is the free software for drawing class diagrams? â€ș

Visual Paradigm Online (VP Online) Free Edition is a FREE online drawing software that supports Class Diagram, other UML diagrams, ERD tool and Organization Chart tool. It features a simple yet powerful editor that allows you to create Class Diagram quickly and easily.

Is Lucidchart free? â€ș

On the Lucidchart registration page, you can choose your account level. The free option allows you to create and edit network diagrams, along with many other diagram types. You can also choose to trial a Pro account for access to even more shape libraries, revision history, and additional storage space.

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