Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
Turn photos into printable black-and-white coloring pages, privately in your browser
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
Convert photos to black-and-white outlines for coloring
Adjustable detail, line thickness, and style settings
Multiple output formats: PDF and PNG
Three conversion styles: Outline, Sketch, and AI Model
Gallery of 160 ready-made printable coloring pages
Browser-based coloring canvas with undo and palette
Chrome extension for right-click conversion
No account or sign-up required
Portrait or landscape orientation on A4 or US Letter
AI Model downloads about 30 MB to run locally on first use
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
All processing runs in your browser with no image uploads or server storage
Mermaid Viewer
Coloring Page Maker