Question 1

Where can I paste Mermaid code to see the diagram?

Accepted Answer

Right here. Paste your Mermaid code in the editor above and the diagram renders instantly in the preview panel. You can then customize the theme, edit the code, and export as PNG, SVG, or PDF. No login or signup required.

Question 2

Is this Mermaid editor free?

Accepted Answer

Yes. The editor, all 21 diagram types, theme customization, and export to PNG, SVG, and PDF are all free. No login required. The Pro plan adds higher resolution export (up to 8x / 768 DPI) and watermark removal for power users.

Question 3

Do I need to create an account?

Accepted Answer

No. Mermaid Editor works entirely in your browser with no account required. Your diagrams are saved locally in your browser's storage. You can start editing immediately — just paste your code and go.

Question 4

What Mermaid diagram types are supported?

Accepted Answer

All 21 Mermaid diagram types: flowcharts, sequence diagrams, class diagrams, ER diagrams, Gantt charts, state diagrams, pie charts, mind maps, user journey maps, git graphs, C4 diagrams, timeline diagrams, sankey diagrams, XY charts, block diagrams, architecture diagrams, quadrant charts, requirement diagrams, kanban boards, packet diagrams, and ZenUML.

Question 5

Can I use dark theme?

Accepted Answer

Yes. The editor includes multiple dark theme presets including Tokyo Night, Dracula, Nord, Moonlight, and more. Open the Style panel to browse and apply themes with one click. You can also customize individual colors.

Paste Mermaid Code — Render Instantly

Why Mermaid Editor?

Where Does Mermaid Code Come From?

Got Mermaid Code from ChatGPT?

Frequently Asked Questions

Explore More

ChatGPT Mermaid Diagrams

High-Resolution Export

Getting Started

Export to PNG

Flowchart Tutorial

ER Diagram Tutorial

Paste Mermaid Code — Render Instantly, No Login Required