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.

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.

  • Choose from 120+ templates
  • Drag and drop shapes, lines, and images
  • View and edit Visio files with a Mac or PC
  • Easily share and collaborate

Over 11,000,000 users

trust Lucidchart to keep them on
the same page

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"Less expensive than alternatives, you can make very professional process maps and charts using it, easy to use, good customer support."

—Diana B

"Where do I start? Price is great. Functionality is great. Company is great. Overall system is awesome and evolving."

—Jonathan M

"Lucidchart is a great app for creating diagrams and flowcharts. It also allows multiple users to work on the same chart at the same time."

—Eric S

"It's simple and intuitive; very easy to use quickly. It doesn't require you to choose lots of options or fiddle around to get things to look good."

—Elizabeth B

"I really enjoy using this program for collaborative projects. The ability for everyone to collaborate in a single space is great."

—David H

"What I like the most about Lucidchart is that it 's easy to use and helps me bring visualization to my work with other teams."

—Kimberly V

"Whenever our sales team needs to mock up something we use LucidChart. The ease of exporting to a pdf is really helpful when it comes to sharing with our team."

—Allyssa C

"You don't have to know what you're doing before you start. It's easy to adjust and move items int he chart."

—Brett F

"Has plenty of objects and templates. Very responsive, easy to use. Professional look. It supports real time collaborative editing. Impressive outcome."

—Simon G

"This is a very intuitive application for flow charting. I think it is much easier to use and has a better end product than Microsoft Visio"

—Aubrey B


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586 reviews

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.

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UML diagram tool

UML diagrams and more

When you’re ready for the next step, you can use Lucidchart to make wireframes and mockups or to start a brand new project. Lucidchart has what you need whether you’re tackling the next item on your to-do list or just trying your hand at drafting a new kind of diagram.

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Collaboration

Real-time collaboration

Lucidchart's collaborative UML tool enables teams to come together online and work in real-time without a single download or system update.

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Drag and Drop

Ease of use

If you’re making a UML diagram, you clearly know what you’re doing, but we want to make it as easy as possible to get the job done. You’ll save time with Lucidchart’s polished interface and smart drag-and-drop editor.

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Feature Highlights

You can start diagramming now with Lucidchart. We make it simple, efficient, and even fun.

  • Drag and drop

    Simple to use

    Lucidchart helps you find what you’re looking for as quickly as possible. Our shapes can be dragged right from the library onto the diagram. You can place shapes exactly where you need them, insert text, and quickly draw lines with just a click.
  • Visio Import and Export

    Visio import/export

    We won’t hold it against you for using Microsoft Visio in the past. It’s easy to import and export Visio files so you can save the work you've already done. The whole experience is fast and seamless.
  • Google Drive

    Fully integrated

    Lucidchart is fully integrated with G Suite. Once you get started with Lucidchart, you’ll be able to find us right in your G Suite along with Gmail and Google Drive. Plus, you can use the same login you use for Google.
  • Share via print or digital

    Publish and share

    You can easily share your UML diagram with your co-workers, clients, or your boss. Your diagrams can be embedded into a webpage or published as a PDF, and Lucidchart’s presentation mode turns your creation into a great-looking visual aid.
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