Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
Free browser-based tools for creating charts, diagrams and converting images to vector files
Stage
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Founded
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Based in
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US
Pricing model
Freemium
Free
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
Pie chart maker with percentages, labels and legend
Bar graph maker with grouped, stacked and horizontal bars
Line graph maker for trends over time with multiple series
Scatter plot maker with line of best fit and R²
Graphing calculator with equations, roots and intersections
PNG to SVG converter with transparent background preservation
Image vectorizer for photos, sketches and logos
Gantt chart maker for project plans with dependencies
Venn diagram maker for two or three sets
SVG to PNG, JPG, PDF and other format converters
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
Private by design: all processing happens on user's device with no data sent to servers
Real vector files: every export available as SVG with editable shapes and live text
No sign-up required and no watermark on exports
Color vision deficiency checked defaults with automatic dark or white text
Share with a link: copy link puts entire chart in address for editing and sharing
Mermaid Viewer
graphsmith