Write text. Get UML diagrams.
PlantUML turns a few lines of plain text into class, sequence, use case and activity diagrams. Free, open source, and made for college projects and real software teams.
Features
Plantuml online makes diagram design easy by writing simple text, previewing instantly, and exporting in any format.
Simple Text to UML Conversion
PlantUML turns plain text into clean UML diagrams. Write a few lines of code and the tool draws your classes, actors and relationships automatically.
Multiple Diagram Types Supported
Create class, sequence, use case, activity, state and deployment diagrams in one place. You can also build ER diagrams, Gantt charts and mind maps.
Automatic Diagram Layout
Forget resizing and aligning boxes by hand. PlantUML arranges shapes and arrows for you, so your diagram stays neat even when you add new classes or steps.
Instant Live Preview
See your diagram update as you edit the code. Fix a typo or add a new relationship and the result appears right away, which saves time on assignments.
Export in PNG, SVG & PDF
Download your diagram for reports, presentations and websites. LaTeX and EPS formats are also supported for research papers and academic documents.
Git-Friendly Plain Text Files
Diagrams are stored as plain text, so you can keep them with your code, compare changes and update them anytime. Great for teams and long projects.
Why Use PlantUML?
Plantuml com is one of the best text-based UML diagram tools for students and developers. It improves:
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- Diagram creation speed
- Layout and alignment
- Team work with Git
- Documentation quality
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This makes it perfect for people who want clean diagrams without dragging shapes.
PlantUML Syntax & Customization
Plantuml com uses a simple text language that is easy to learn and flexible enough for large projects.
- Supports class, sequence, use case and activity diagrams
- Lets you reuse code with themes and includes
- Gives control over colors, fonts and layout
- Ideal for both beginners and advanced users
Usage & Licensing
PlantUML is an open-source diagramming tool, which means you can use it for free in your college projects, personal work and company documentation. You can create diagrams for both public and private projects.
However, it is always a good idea to read the license terms and give proper credit by linking back to the official PlantUML project page. This helps other users find the latest updates and supports the developers who maintain the tool.
Bug Reports & Issue Tracking
If you find a bug, a syntax error or a rendering problem while using PlantUML, please report it through the official GitHub repository or the community forum. Include your Plantuml online code and the expected result in the report. Detailed reports help the developers fix issues faster and improve future versions. For problems with this website, use our contact page.
How to Create a UML Diagram with PlantUML Online
Follow these simple steps to create your first UML diagram and export it for your project or report:
Step 1: Open the Online Editor
Open the plant uml editor in your browser. Nothing needs to be installed.
Then decide which diagram you want to make, such as class, sequence or use case.
Step 2: Write the Diagram Code
Every diagram starts with @startuml and ends with @enduml.
Copy a sample from our Examples section and change the names to match your project.
Step 3: Add Elements and Relationships
- Add your actors, classes or components using keywords like
actorandclass. - Connect them with arrows such as
->or-->. - Write a label after a colon to describe each message or relation.
⚡ Tip: If your diagram does not appear, check that both @startuml and @enduml are present and every keyword is spelled correctly.
Step 4: Preview and Export
- Check the live preview next to your code
- Edit the text until the diagram looks right
- Download it as PNG, SVG or PDF
About Us
Plantuml com helps you create UML diagrams from plain text. We provide a free online editor, project examples and step-by-step guides for students and developers.
A text-based tool designed to make UML diagrams simple and fast