Are my diagrams sent to a server?

No. All rendering and exporting happens locally in your browser. Your data is 100% private.

What formats can I export to?

You can export your diagrams as SVG, PNG, or JPG images.

Yes, you can choose from default, dark, forest, neutral, and base themes.

Render, edit, and export Mermaid diagrams (SVG, PNG, JPG) purely in your browser. Features real-time preview and multiple themes.

Real-time Preview Rich Templates Multiple Themes Pan & Zoom Rich Exports 100% Private

A powerful, local Mermaid diagram editor with high-quality exports.

Real-time Preview

See your diagram update instantly as you type.

Rich Templates

Quickly start with pre-built diagram templates for various use cases.

Multiple Themes

Switch between beautifully designed built-in themes.

Pan & Zoom

Freely zoom in and out or pan around large and complex diagrams.

Rich Exports

Download your diagrams in vector (SVG) or raster (PNG, JPG) formats.

100% Private

Everything runs in your browser. No server uploads at all.

Preview Mermaid flowcharts, sequence diagrams, and ERDs in the browser, fix common syntax errors, switch themes, and export crisp SVG or PNG files.

Find answers to the most common questions.