Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
Free, open-source presentation software
Stage
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Founded
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Based in
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Pricing model
Freemium
Open source
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
Open and save .pptx PowerPoint files
Text, images, charts, and vector shapes
Fills, gradients, and formatting options
Transitions and animations
Speaker notes and presenter tools
Slide sections for organization
WebAssembly browser editor
Desktop apps for Mac, Windows, and Linux
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
Completely free with no subscription required
Open-source code that users can inspect and improve
Mermaid Viewer
DeckCraft