An intuitive UML diagram tool for drawing entire systems online

Visualize, build, and document software systems and processes online with a UML diagram tool. Design and communicate technical plans with a unified language everyone understands.
An image showing Miro's UML diagram maker
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accenture.svgbumble.svgdelloite.svgdocusign.svgcontentful.svgasos.svgpepsico.svghanes.svghewlett packard.svgdropbox.svgmacys.svgliberty mutual.svgtotal.svgwhirlpool.svgubisoft.svgwalt disney.svgyamaha.svgwp engine.svg

Design iteratively

Generate a UML diagram in seconds using Miro AI — allowing you to jump straight to the editing and customization process. Visually communicate development plans and mitigate misalignment across your organization — all in one UML diagram maker.
An image showing Miro's UML diagramming shape pack

Draw new systems

Craft technical diagrams faster with Miro’s complete UML shape packs. Use the comments feature to get instant feedback, save time when diagramming, and co-create a standardized way to build and document systems processes with your team.
An image showing a UML diagram made in Miro

Expand your diagramming capabilities

Miro’s online UML diagram tool makes it easy to research, outline, and deliver your technical plans with intuitive diagramming functions — from industry-recognized UML shape packs to designing in our dedicated Diagramming mode.
An image showing Miro's UML diagram maker, featuring the built-in UML shape pack

Why Miro is your best UML diagram maker

Brainstorm

Shape your ideas

When facilitating discussions about technical plans, foster conditions for innovative solutions. When everyone’s voice is heard, new and surprising ideas might emerge. Bring agility to your iteration sessions with integrations such as Jira, Airtable, Coda, and more.
categorization

Have a starting point for improvements

Draw a UML diagram online from existing code to help your team understand the underlying issues. Regardless of your coding language, UML diagrams allow you to communicate ideas and solve the most pressing problems before you even write new code.
papers

Maximize collaboration

Easily test and review your system architecture with technical stakeholders using Miro’s UML diagram tool. Understand the problem immediately and start sketching solutions on your UML diagram. Quickly adapt and respond to changes as you design your development roadmap.
collaboration

Work iteratively with a range of UML diagrams

Miro lets you collaborate in real time, so teams can come together and share ideas in one collaborative space. Avoid the delays and errors that usually happen when working on UML diagrams individually, and achieve faster development times and better outcomes.

More than just a UML diagram creator

Miro expands the way you work and gives you infinite possibilities for diagramming, planning, and designing your technical plans.

Related templates

How to make a UML diagram with Miro

1. Choose the ready-made template

Head to the toolbar, click on “Templates” and choose “UML diagram.” Alternatively, follow the next step to code your own diagram.
An image showing how to build a UML diagram in Miro using Miro's UML shape pack

2. Code your diagram

Using our PlantUML or Mermaid app is easy. Head to the toolbar, click on “More apps” and look for either app. Paste your code into the editor, or edit one of the sample diagrams.

3. Review your diagram

Whether you coded your diagram, used a template, or built one from scratch using our UML diagram maker — it’s worth getting some eyes on it. Invite others to view and comment on your board.

4. Share your diagram

Export your diagram as a PDF or image, generate a sharable link to your Miro board, or embed it on other sites.
See more in detail
An image showing how to build a UML diagram in Miro using Miro's UML shape pack

UML Diagram tool FAQs

Which tool is best for creating UML diagrams?

There are many UML diagram tools available — you just need to find the one that caters to your needs. You can create a diagram online and try Miro for free. You can also sign up for an account to try out advanced diagramming capabilities that allow you to sketch, build, and document UML diagrams on an infinite canvas that’s easy to share and edit. Together with your team, in real-time or async, you can finally get rid of complex workflows and improve how you diagram solutions for your systems and engineering networks. Give it a try and start diagramming today.

How can I start creating a UML diagram?

First, decide what type of UML diagram best suits your needs and what you’ll use it for. Once you’re ready, start drawing your UML diagram using our ready-made templates or create one from scratch. There are 14 UML diagram types, divided into two categories: behavioral and structural. Regardless of which UML diagram you want to build, the basic steps are the same: arrange your diagram elements on the board and select the UML shape pack using our Shape Library. You can then connect the elements with connector lines and indicate flows with arrows. Then, label the steps to identify the relationships between components and color code essential features. If you want to learn more about diagramming with Miro, visit our Help Center or join a live training session with Miro Academy.

Get on board in seconds

Join thousands of teams using Miro to do their best work yet.
accenture.svgbumble.svgdelloite.svgdocusign.svgcontentful.svgasos.svgpepsico.svghanes.svghewlett packard.svgdropbox.svgmacys.svgliberty mutual.svgtotal.svgwhirlpool.svgubisoft.svgyamaha.svgwp engine.svg
accenture.svgbumble.svgdelloite.svgdocusign.svgcontentful.svgasos.svgpepsico.svghanes.svghewlett packard.svgdropbox.svgmacys.svgliberty mutual.svgtotal.svgwhirlpool.svgubisoft.svgyamaha.svgwp engine.svg