Diagramming

PlantUML

An open-source tool that generates UML and other diagrams from simple textual descriptions.

Overview

PlantUML enables users to create UML and various other diagrams using a straightforward text-based language, supporting multiple diagram types and export formats. It operates as a diagram generator with smart layout algorithms and high customizability.

Updated Oct 21, 2026

1 thing

What PlantUML has

For developers

Programmatic access to the product's data and features for developers.

3 features

Key Features

Diagram creation
PlantUML is a highly versatile tool that facilitates the rapid and straightforward creation of a wide array of diagrams.
Diagram language
Utilizing a simple and intuitive language, users can effortlessly draft various types of diagrams.
Browser editor
This editor runs entirely in your browser thanks to our JavaScript rendering engine . Edit the code on the left and see the diagram update instantly!

Pros and cons

Pros

Open-source and free to use with no licensing fees.
Supports a wide range of UML and non-UML diagram types.
Text-based input allows easy version control and quick edits.
Multiple export formats suitable for different documentation needs.
Smart layout algorithms automate element arrangement for clarity.

Cons

Limited manual control over precise diagram layout compared to some modeling tools.
Server-based rendering may raise privacy concerns for sensitive diagrams unless self-hosted.
Large diagrams can cause memory issues and require configuration adjustments.
Learning curve for mastering the PlantUML language syntax and layout pragmas.
Does not enforce UML modeling rules, so inconsistent diagrams can be created.

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Featured Video

See PlantUML at work before you try it.

Watch on YouTube

0 questions

Frequently Asked Questions

Community reviews

Write a review

No written reviews yet. Be the first to share your experience.

Community reviews

Write a review

No written reviews yet. Be the first to share your experience.

1 thing

What PlantUML has

For developers

Programmatic access to the product's data and features for developers.

3 features

Key Features

Diagram creation
PlantUML is a highly versatile tool that facilitates the rapid and straightforward creation of a wide array of diagrams.
Diagram language
Utilizing a simple and intuitive language, users can effortlessly draft various types of diagrams.
Browser editor
This editor runs entirely in your browser thanks to our JavaScript rendering engine . Edit the code on the left and see the diagram update instantly!

Pros and cons

Pros

Open-source and free to use with no licensing fees.
Supports a wide range of UML and non-UML diagram types.
Text-based input allows easy version control and quick edits.
Multiple export formats suitable for different documentation needs.
Smart layout algorithms automate element arrangement for clarity.

Cons

Limited manual control over precise diagram layout compared to some modeling tools.
Server-based rendering may raise privacy concerns for sensitive diagrams unless self-hosted.
Large diagrams can cause memory issues and require configuration adjustments.
Learning curve for mastering the PlantUML language syntax and layout pragmas.
Does not enforce UML modeling rules, so inconsistent diagrams can be created.

You?

Be the first to rate PlantUML

Your review helps others make better decisions. No account needed. Takes about 10 seconds.

Featured Video

See PlantUML at work before you try it.

Watch on YouTube

0 questions

PlantUML

Overview

What PlantUML has

For developers

Key Features

Diagram creation

Diagram language

Browser editor

Pros and cons

Pros

Cons

Be the first to rate PlantUML

Featured Video

Frequently Asked Questions

What PlantUML has

For developers

Key Features

Diagram creation

Diagram language

Browser editor

Pros and cons

Pros

Cons

Be the first to rate PlantUML

Featured Video

Frequently Asked Questions

More in Diagramming

More in Diagramming