Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
QR codes that keep working forever
Stage
Not given
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Founded
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Based in
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US
Pricing model
Freemium
Free trial
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
Pro: $3/mo after 7-day free trial (card required)
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
Static QR generator for URLs, text, WiFi, vCard, email, SMS
PNG and SVG downloads
Dynamic codes with scan analytics by day, country, and device class
Code Health Monitor alerts for broken destination URLs
Migrate deactivated competitor codes
One-click subscription cancellation
Customizable colors and optional logo
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
Static codes generated in your browser never route through servers and keep working forever after cancellation
Code Health Monitor checks if printed code destinations go down and emails you to fix the link without reprinting
Affordable pricing with no server-side kill switch on static codes after cancellation
Mermaid Viewer
QR Promise