Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
AI font generator for handwriting and lettering images
Stage
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Founded
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Based in
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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
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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
AI generation from text description, handwriting sample, or both
TTF file download and export
Support for five languages with Latin character sets
Image upload up to 20 MB in PNG, JPG, or WEBP format
Automatic language detection
Undo and redo in glyph editing
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
Works entirely in browser with no installation required
Free tier with 50 lifetime credits includes all editing and export features
No commercial rights restrictions disclosed beyond user responsibility to source material
Transparent credit system tied to explicit operations, not usage-based
Mermaid Viewer
MakeFont