Online Sequence Diagram Maker
Create UML sequence diagrams with simple text syntax
Diagram Code
Quick Syntax Guide
Diagram Preview
Enter diagram code to see preview
Your sequence diagram will appear here
Example Templates
When to Use Sequence Diagrams
API Documentation
Document REST API flows, web service calls, and microservice interactions for technical documentation
System Design
Visualize system architecture, component interactions, and data flow during software design phase
Authentication Flows
Design and document user login, OAuth flows, JWT token exchanges, and security protocols
Debugging Complex Issues
Trace message flows and identify bottlenecks in distributed systems and multi-tier applications
Teaching & Learning
Explain object-oriented programming concepts, design patterns, and software engineering principles
Team Communication
Share technical designs with developers, stakeholders, and clients using clear visual diagrams
Frequently Asked Questions
What is a sequence diagram?
A sequence diagram is a type of UML (Unified Modeling Language) diagram that shows how objects interact with each other in a particular scenario. It displays the sequence of messages exchanged between objects over time, making it ideal for documenting and visualizing system behaviors, API interactions, and process flows.
How do I create a sequence diagram with this tool?
Creating a sequence diagram is simple: 1) Use the text editor to write your diagram using Mermaid syntax, 2) Start with 'sequenceDiagram' and add participants, 3) Define interactions using arrows (-> for solid, --> for dashed), 4) The diagram updates in real-time, 5) Export your diagram as PNG or SVG when done. Example: Alice->>Bob: Hello!
What syntax does this tool use?
This tool uses Mermaid.js syntax, which is simple and intuitive. Basic syntax includes: 'sequenceDiagram' to start, 'participant Name' to define actors, 'A->>B: Message' for solid arrows, 'A-->>B: Message' for dashed arrows, 'activate/deactivate' for lifelines, and 'Note' for adding annotations. The syntax is designed to be human-readable and easy to learn.
Can I export my sequence diagrams?
Yes! You can export your sequence diagrams in two formats: PNG (raster image, perfect for presentations and documents) and SVG (vector format, scalable without quality loss). Simply click the Download PNG or Download SVG button after creating your diagram. Both formats maintain high quality and can be used in various applications.
Is this sequence diagram tool free?
Yes, our online sequence diagram maker is completely free to use with no registration required. Create unlimited diagrams, export to PNG/SVG, and access all features without any costs or limitations. No credit card needed, no watermarks on exports.
What are sequence diagrams used for?
Sequence diagrams are used for: documenting API interactions and web service calls, designing system architecture and workflows, visualizing user authentication flows, planning database transactions, communicating technical designs to team members, creating software documentation, debugging complex interactions, and teaching object-oriented programming concepts.
Do I need to install any software?
No installation required! This is a completely web-based tool that runs in your browser. Simply open the page, start typing your diagram syntax, and see real-time results. All processing happens in your browser using JavaScript, so your diagrams remain private and secure.
Can I save my diagram for later editing?
While the tool doesn't store diagrams on servers for privacy, you can save your work by: copying the text syntax to a file, exporting as PNG/SVG for visual reference, or using your browser's local storage feature. We recommend keeping the source text so you can edit and regenerate the diagram anytime.
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