Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
Your handwriting, as a real font.
Stage
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Founded
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2023
Based in
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US
Pricing model
Freemium
Paid
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
Drop in photos of existing handwritten pages like notebook pages and letters (beta)
Print template and photograph for complete font creation
Edit individual letters: move, resize, clean up, or redraw
Letter variants and multiple font weights
One-click installation or export to .ttf and .woff formats
Private on-device processing with no uploads or accounts
Works with Pages, Keynote, Figma and other applications
Compatible with macOS 14 Sonoma or later on Apple Silicon or Intel
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 stays on your Mac with no uploads or accounts required
Can read both printed templates and existing handwritten pages
Editable letters let you customize each character before finalizing
Create letter variants and multiple font weights from one handwriting sample
Mermaid Viewer