Mermaid Diagram Renderer
Render Mermaid diagrams in your browser β flowcharts, sequence, class, state, Gantt, pie, ER, and user journey diagrams. Live preview, light/dark themes, and SVG/PNG export. 100% client-side, no server.
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What is Mermaid Diagram Renderer?
The Mermaid Diagram Renderer turns Mermaid markdown into visual diagrams entirely in your browser. Mermaid is a text-based diagramming language that lets you describe flowcharts, sequence diagrams, class diagrams, state diagrams, Gantt charts, pie charts, entity-relationship diagrams, and user journey maps using simple, code-like syntax. Type your definition into the editor and the renderer produces a live SVG preview with light/dark theme support. You can copy the SVG markup or download the diagram as an SVG or high-resolution PNG β all 100% client-side with no server uploads.
Key Benefits
- 100% client-side: your diagram code is rendered in the browser and never uploaded to any server
- Supports eight diagram types including flowchart, sequence, class, state, Gantt, pie, ER, and user journey
- Live preview that re-renders as you type with helpful syntax-error messages
- Light and dark themes with automatic site-theme detection
- One-click export to SVG markup, SVG file, or high-resolution PNG
Common Use Cases
- β’Documenting system architecture and data flow for engineering wikis and README files
- β’Designing sequence and class diagrams during API and database planning
- β’Building Gantt charts and project timelines for sprint planning
- β’Creating user journey maps for product and UX research
- β’Drafting flowcharts for Standard Operating Procedures and decision trees
How to Use the Mermaid Diagram Renderer
- Write or paste Mermaid code: Enter your Mermaid diagram definition in the code box. You can also load an example preset from the dropdown.
- Pick a theme: Switch between Light and Dark themes to match your preference or the site theme.
- Review the live preview: The diagram renders automatically as you type. If there is a syntax error, the error message appears below the editor.
- Copy or download: Copy the SVG to your clipboard, or download the diagram as an SVG or PNG file for use in docs and slides.
Key Features
- Live preview that re-renders as you type with a 500ms debounce
- Supports flowchart, sequence, class, state, Gantt, pie, ER, and user journey diagrams
- One-click example presets for all eight diagram types
- Light and dark themes with automatic site-theme detection
- Export the rendered diagram as SVG or high-resolution PNG
- 100% client-side rendering β your code never leaves the browser