Mermaid diagram generator
GenerateExperimentalLimited support. Verify anything critical.
A Mermaid diagram generator translates text-based diagram syntax into a scalable graphic directly in the browser. It is useful for flowcharts, sequence diagrams, entity relationships, state diagrams, timelines, and Gantt plans that should remain reviewable as source text. The renderer loads only after you request a preview, uses Mermaid's strict security mode, and sanitizes the returned SVG before displaying or downloading it from the current tab.
Skip to the toolThis tool processes the values or files you choose on your device. They are not uploaded.
Output
Limits
- Source is limited to 50000 characters
- support follows the bundled Mermaid version.
Warnings
- Review generated diagrams for layout and meaning before publication.
How to use Mermaid diagram generator
Diagram as maintainable text
Text syntax works well in version control because reviewers can see structural changes without comparing opaque binary files. Keep node labels short and add explanatory prose outside complex graphics.
Safe rendering boundary
Strict Mermaid configuration and SVG sanitization reduce active-content risks. External links and custom embedded HTML should still be treated cautiously.
How it works
- Enter what you haveType or pick your Mermaid syntax. Nothing is submitted anywhere.
- It runs in this tabThe calculation happens on your device, using your browser's own data.
- Take the resultRead the sanitized SVG, live preview, then copy, download, or share a link.
Rendering uses bundled Mermaid with strict security settings and a separate SVG sanitization pass.
- Basis
- ported-mit
- Licence
- MIT
- Last reviewed
Frequently asked questions
Is the diagram sent to a rendering service?
No. Mermaid is bundled with the site and rendering happens locally after the Run button is pressed.