What is NoFussDiagram?

NoFussDiagram is a free online Mermaid.js diagram editor. You write Mermaid syntax and instantly see your diagram rendered with live preview. No login, no installation — works entirely in your browser.

What diagram types does NoFussDiagram support?

NoFussDiagram supports all major Mermaid.js diagram types: flowcharts, sequence diagrams, Gantt charts, ER diagrams, class diagrams, and state diagrams.

Can I export diagrams to PNG or SVG?

Yes. NoFussDiagram lets you export your diagram as a PNG image or copy the SVG code directly. You can also copy the raw Mermaid markdown.

Is NoFussDiagram free to use?

Yes, NoFussDiagram is completely free. No account or login is required. Just open the site and start diagramming.

NoFussDiagram — Free Online Mermaid Diagram Editor

NoFussDiagram is a free, browser-based Mermaid.js diagram editor. Write Mermaid syntax and see your diagram render in real time. No login or installation required.

Supported Diagram Types

Flowchart
Sequence Diagram
Gantt Chart
ER Diagram
Class Diagram
State Diagram

Features

Live Mermaid.js rendering in the browser
Pan and zoom diagram preview
Export diagrams to PNG or SVG
Copy Mermaid markdown or SVG code
Light and dark diagram themes
Sequence diagram participant pinning
Built-in templates for all diagram types
Fullscreen preview mode
Completely free — no account required

Please enable JavaScript to use NoFussDiagram.

Write Mermaid syntax to render or load a template from the dropdown

100%

Press Esc or F to exit fullscreen