Mermaid Editor
Loading diagram editor...
About This Tool
Mermaid (Mermaid.js) is a diagramming and charting tool that lets you define diagrams using text-based Markdown-inspired syntax. This editor provides a live preview environment where you can write Mermaid code and see the resulting diagram update instantly.
Whether you need flowcharts, sequence diagrams, class diagrams, entity relationship diagrams, Gantt charts, pie charts, mind maps, or git graphs, this editor supports all Mermaid diagram types. Choose from over 30 curated templates to get started quickly. Export your finished diagrams as PNG, SVG, PDF, JPG, or WebP images.
Common Use Cases
- Creating architecture diagrams and system flowcharts for technical documentation
- Designing sequence diagrams for API interactions and microservice communication patterns
- Building Gantt charts for project timelines and sprint planning
- Generating entity relationship diagrams for database schema documentation
Pro Tips
- Use %% comments in Mermaid code for configuration that doesn't appear in the rendered diagram
- Start with a template from the gallery to save time — each template shows the code structure you need
- Export as SVG for scalable vector graphics that look sharp at any resolution
Frequently Asked Questions
- What is Mermaid?
- Mermaid is a JavaScript-based diagramming tool that renders Markdown-inspired text definitions into diagrams. It supports flowcharts, sequence diagrams, class diagrams, ER diagrams, Gantt charts, and more.
- Is Mermaid free to use?
- Yes, Mermaid is open-source (MIT license). This editor provides a free, no-login interface to create and export Mermaid diagrams directly in your browser.
- Can I export diagrams in different formats?
- Yes. This editor supports exporting to PNG, SVG, PDF, JPG, and WebP formats. SVG is recommended for scalable graphics that look sharp at any resolution.
Part of the FreeQ.One tools suite.