Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
Free parametric packaging dieline generator for FEFCO and ECMA box styles
Stage
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Founded
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Based in
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Pricing model
Freemium
Free
Pricing
Free: unlimited editor and preview, 3 saved diagrams, 5 AI uses total, PNG export 1× with watermark. Starter: $6.99/month or $69.90/year; 30 saved diagrams, 500 AI conversations per month, PNG export up to 4× without watermark. Pro: $11.99/month or $119.90/year; unlimited diagrams, unlimited AI, PNG
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Key features
Live preview of Mermaid code as you type
AI diagram generator, editor and syntax fixer
PNG export on every plan; JPG, SVG and PDF on Pro
All 22+ Mermaid diagram types supported
Share diagrams via public links and embeds
Save diagrams to cloud with folders and version history
Keyboard shortcuts and autocomplete
Mobile-responsive editor with pan and pinch-zoom
Live 2D preview and 3D fold visualization
Real-time dimension updates
Three dimension entry options (inside, outside, crease-to-crease)
244 FEFCO corrugated box codes
206 ECMA folding carton codes
Plate-checked badge system for template accuracy
Adjustable parameters for board caliper, slot widths and corner clearances
What makes it different
No account or sign-up required to start editing diagrams
Affordable pricing: Starter at $6.99/month, Pro at $11.99/month
Diagrams render in your browser; nothing stored unless you choose to save
Fast editor with instant rendering and clear error messages
Parametric generation redraws correctly when dimensions change, not stretching a picture
Mermaid Viewer
Box Blanks