Mermaid Diagram Generator

100% Free · Client-Side

Create professional diagrams using Mermaid syntax. Live preview, theme customization, and export to high-quality SVG or PNG images. Supports Flowcharts, Sequence Diagrams, Gantt charts, and more.

Mermaid Syntax

Appearance Settings

Theme

Live Preview

Enter Mermaid syntax to see preview

Free Online Mermaid Diagram Generator

Our Mermaid Diagram Generator is a powerful, privacy-focused tool that lets you create professional diagrams using simple text syntax. Whether you're a developer documenting code or a manager planning workflows, our tool helps you turn text into visual clarity instantly.

Multiple Diagram Types

Generate everything from simple flowcharts and sequence diagrams to complex Gantt charts, ER diagrams, and Mindmaps using the versatile Mermaid syntax.

Instant Export

Download your diagrams as scalable SVG files for infinite resolution or high-quality PNG images for easy sharing in presentations and documents.

Frequently Asked Questions

What is Mermaid syntax?

Mermaid is a JavaScript-based charting and diagramming tool that uses Markdown-inspired text definitions to create and modify diagrams dynamically. It supports flowcharts, sequence diagrams, Gantt charts, class diagrams, and more.

Is my data secure?

Yes, all processing happens locally in your browser. Your diagram syntax and the generated images are never sent to our servers.

How do I change the look of my diagram?

You can use the built-in theme selector to choose between different styles like Default, Dark, or Forest. You can also customize specific colors directly within the Mermaid syntax using style classes.