Mermaid Diagram Playground
Transform your architectural thoughts into professional diagrams instantly. Type Mermaid.js syntax and watch your flowchart, sequence diagram, or Gantt chart render in real-time.
Local Processing
Your tool input is processed locally in your browser and is not sent to DevToolsLabs servers.
How to use this tool
- Type or paste Mermaid.js syntax into the editor on the left
- Watch the live preview update instantly on the right
- Use the category buttons (Flow, Seq, Gantt) for quick templates
- Copy the generated SVG code for use in your documentation
Example Usage
graph LR A --> B
[SVG Diagram Rendering]
When to use this tool
- Visualizing system architecture in READMEs
- Designing complex workflow logic
- Quickly generating Gantt charts for project planning
Frequently Asked Questions
Is my diagram data sent to any server?
No. The Mermaid.js rendering engine runs entirely in your browser. Your diagram code never leaves your computer.
Can I themes the diagrams?
Our playground uses a neutral developer-friendly theme by default, but you can override it using Mermaid.js directives directly in the editor.
Built by Developers, For Developers
DevToolsLabs is maintained as an open-source collection of focused developer utilities. Most transformations run locally in your browser; tools that require a network service disclose the destination beside the tool. Each utility is built around a concrete development workflow and can be reviewed in the public source repository.