Free PlantUML Sequence Diagram Builder

Visualize Your Works

PlantUML Sequence Diagram Builder

An intuitive wizard-style free application that abstracts away the complexities of PlantUML syntax. Design, build, and export professional diagrams with zero coding.

Powerful Features to Streamline Your Workflow

Everything you need to create professional sequence diagrams without the learning curve.

Visual Wizard Interface

Instead of writing code, use intuitive forms to define participants, messages, and logic, making diagram creation faster and error-free.

Real-time Output

A side-by-side view shows the generated PlantUML code and rendered SVG diagram, both updating instantly as you make changes.

Import/Export to JSON

Save your entire diagram state as a JSON file to save your work, share with colleagues, or place it under version control.

Rich Example Gallery

Kickstart your work with numerous pre-built examples for common scenarios like user logins, API flows, and e-commerce orders.

Create a Diagram in 4 Simple Steps

Our guided process makes free diagramming fast, intuitive, and enjoyable.

Set Title & Define Participants

Start by giving your diagram a title. Then, use the simple form to add each participant, specifying its type (Actor, Database, etc.) and display name.

Build the Sequence Flow

Add messages, notes, dividers, and logical fragments (Alt, Opt, Loop) step-by-step. The visual editor makes it easy to structure and reorder events.

Review Live Output

Instantly see the generated PlantUML code and the rendered SVG diagram in the side panel. Your diagram comes to life with every change you make.

Save, Export, or Load

Save your work as a JSON file for later, or export the SVG/PlantUML code for use in documentation, presentations, and code repositories.

Unlock Your Team's Potential

Move faster, reduce mistakes, and improve communication. Our free generator empowers everyone to contribute to system design and documentation.

Enhanced Accessibility
Lowers the barrier to entry for creating PlantUML diagrams. No prior syntax knowledge is required.
Increased Efficiency
The form-based interface accelerates the creation and modification of diagrams, saving valuable time.
Reduced Errors
Always generates syntactically correct PlantUML code, eliminating common manual coding errors.
Immediate Feedback
Real-time rendering allows you to instantly see the result of your changes, speeding up the design process.
Code Portability
Outputs standard PlantUML code that can be used across the entire ecosystem of PlantUML-compatible platforms.
Seamless Collaboration
The JSON import/export feature provides a simple mechanism for sharing and versioning diagrams.

Built for Professionals Across Disciplines

A versatile tool designed for a wide range of roles involved in technology, design, and business process modeling.

Software System Development

System Architects

Business Analysts

Product Managers

QA Engineers

Students & Educators

Technical Writers

DevOps Engineers

Ready to Create Better Diagrams in a Faster Way?

Stop wrestling with syntax and start visualizing your systems. Launch the free tool and create your first diagram in minutes.