What this tool helps with
Create diagrams from code with this online editor. Supports Mermaid and PlantUML syntax for flowcharts, sequence diagrams, and more. Features real-time preview and SVG/PNG export.
Recommended workflow
- 1Select Type - Choose between Mermaid or PlantUML diagram types
- 2Choose Template - Select an appropriate diagram template from the presets to get started
- 3Write Code - Enter or modify the diagram code in the code editor
- 4Real-time Preview - View the real-time rendering effects of your diagram as you type
- 5Export Diagram - Export the finished diagram as an SVG or PNG file
Capability details
- Mermaid Support - Supports flowcharts, sequence diagrams, class diagrams, Gantt charts, and more
- PlantUML Support - Supports use case diagrams, activity diagrams, component diagrams, sequence diagrams, etc.
- Real-time Preview - Automatically re-renders after code modification, providing a WYSIWYG experience
- Template Library - Built-in common diagram templates for a quick start
- Multi-format Export - Supports SVG vector format and PNG bitmap format
- Syntax Help - Built-in syntax help for quickly learning the diagram syntax
Practical use cases
- System Design - Draw system architecture diagrams and flowcharts for planning
- Requirements Analysis - Create use case diagrams and activity diagrams to define needs
- Project Management - Create Gantt charts and project timelines to track progress
- Code Documentation - Generate class diagrams and component diagrams for code projects
- Business Process Modeling - Organize and visualize complex business processes
- Teaching & Demos - Create educational diagrams and illustrations for presentations
Privacy, rights, and limits
Most processing is designed to run in the browser whenever possible, which makes the tool useful for quick personal or work files. For sensitive, production, or regulated material, test with a sample first and confirm the target platform's format, size, and quality requirements.
Common questions
What diagrams can this tool create?
It is useful for flowcharts, architecture diagrams, sequence diagrams, relationship maps, and simple technical-documentation visuals.
Why does a diagram fail to render?
Common causes include syntax errors, unescaped special characters in node labels, or incomplete diagram structure.
How do I make diagrams easier to publish?
Keep labels short, maintain clear hierarchy, and check readability in mobile views or PDF exports before sharing.