Free live Mermaid diagram editor with no signup required
The whiteboard for you, your team and your AI
Stage
Not given
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Founded
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Based in
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Pricing model
Free
Freemium
Pricing
Not given
Free: unlimited local boards and 3 cloud boards, no card required. Pro: $6.99 per month or $69.99 per year (about 17% less than twelve monthly payments), first month free.
Key features
Live preview as you type
21 diagram types including flowcharts, sequence, class, state, ER, Gantt, git graph, mindmap and timeline
Two-way editing for flowcharts
SVG and PNG export
Share diagrams as URLs with embedded diagram content
Built-in template picker and cheatsheet
No account or signup required
Works entirely in browser with local storage
Open Mermaid Live Editor links
Mermaid v11 syntax support
MCP server for Claude, ChatGPT and other AI apps
Real-time collaboration
Infinite canvas with hand-drawn feel
Local-first storage with optional cloud sync
End-to-end encrypted snapshot links
Sketched-shape recognition
Lasso selection
Presentation mode
Version history
Extensible with marketplace extensions
What makes it different
No signup, paywall, or data collection required
Diagrams stay in your browser's local storage by default
Two-way editing that updates code when you edit the canvas
Live preview with no render button required
Clean SVG export for professional use in docs and slides
AI integration with your own AI via MCP, not built-in
Local-first architecture keeps your data on your device by default
Extensible platform with marketplace and custom extensions
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