Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
Transform your handwriting and calligraphy into fully functional vector fonts
Stage
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Pricing model
Freemium
Freemium
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
Free: create one handwriting font forever with no card required. Pro Font: $5.99 per font once to unlock full character set and commercial licence. Font packs: Pro Font ×3 for $14.99 ($5.00 per font), Pro Font ×5 for $19.99 ($4.00 per font). Studio: $8.99 per month for unlimited Pro font unlocks, or
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
Draw letters with mouse, finger or stylus with pressure and palm rejection support
Adjustable pen, marker and fountain-nib brushes for different lettering styles
Tune spacing before and after each character plus global letter spacing
Real vector OTF and TTF export files
Save up to three versions of each letter with automatic randomization
Create custom ligatures and built-in ligatures
Smoothing to clean up shaky strokes without a tablet
Cloud sync and version history on Studio plan
Cross-device progress saving and syncing
Preview fonts with custom text and see missing characters
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
Complete ownership of fonts you create with no borrowed outlines or templates
Works with mouse, trackpad or stylus thanks to adjustable smoothing
Free forever option for personal use with no credit card required
Commercial licence included with Pro fonts and Studio
Download draft fonts before completing all 52 letters
Mermaid Viewer
HandFonty