Homediagramminguml diagram

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

Over 70M+ users love Miro.

Design iteratively

Turn sketches into detailed UML diagrams at the exact pace you validate and refine solutions. 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 easy object insertion and smart drawing features.

An image showing Miro's UML diagram maker, featuring the built-in UML shape pack

Why Miro is your best UML diagram maker

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.

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.

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.

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.

Related templates

Visualize processes, development, and behavior with a unified language.

Understand the order in which the events within a sequence interact with each other.

Plan object-oriented systems in a joint workspace that fosters collaboration and innovation using a UML class diagram.

Plan, analyze, and optimize activities by breaking them into subprocesses and constituent decisions with our Activity Diagram template.

Plan, draw, and share an object-oriented system’s elements and components using our Component Diagram Template.

Visualize the workflow of a process and how objects perform actions.

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.


Miro’s all-in-one diagram maker removes the hassle of switching between diagramming and collaboration tools while helping you check off all the essential steps of your diagramming process.

Learn more

UML Class Diagram

Quickly understand the multiplicity of your system with Miro’s UML class diagram tool. Help your team visualize dependencies, objects relationships, classes, and attributes — all in one tool.

Learn more

UML Sequence Diagram

Map out systems and interactions between different actors using Miro’s sequence diagram tool. Picture success cases, troubleshoot issues, and understand events as they happen within a system.

Learn more

UML Component Diagram

Unlike any other UML diagram, the component diagram helps you imagine the physical components of your system and how they are connected. Use this tool to plan development and visualize how complex systems are wired.

Learn more

UML Communication Diagram

Draw complex logic chains and build a complete map of your systems with Miro’s UML communication diagram. See the big picture and enable your team to plan new functions and scenarios, all in one tool.

Learn more

UML State Machine Diagram

Easily document, visualize, and refine your technical designs with Miro’s UML state machine diagram tool. Understand objects' actions at different stages, changes over time, and implement ideas more efficiently.

Learn more

UML Activity Diagram

Depict workflows and break them into bite-sized activities to better understand your system and programs flow. Miro’s UML activity diagram tool allows you to convey information concisely and clearly to everyone, from developers to business managers.

Learn more

flowchart creation for UML

Flowchart creation

Create flowcharts at speed and simplify your workflows and daily routines with Miro’s flowchart creator. Check off all the essential steps in your process, from alignment to making information actionable.

Learn more

An image of a diagram made with Miro's built-in Mermaid diagram editor

Mermaid app

Create a wide range of diagrams online using an intuitive Mermaid diagram editor — from flow charts to UML sequence diagrams. Easily import existing diagrams, copy code from other sources, and seamlessly make edits.

Learn more

An image of a diagram made using Miro's PlantUML editor app

PlantUML app

Use the PlantUML editor app to easily create and import diagrams with a plain text language. Automate the process of generating complex diagrams without worrying about design and layout.

Learn more

How to make a UML diagram with Miro

An image showing how to build a UML diagram in Miro using Miro's UML shape pack


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.


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.


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.


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.

An image showing how to build a UML diagram in Miro using Miro's UML shape pack

UML Diagram tool FAQs

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.

Get on board in seconds

Join thousands of teams using Miro to do their best work yet.