Free live Mermaid diagram editor with no signup required
Stage
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Founded
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Based in
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Pricing model
Freemium
Free
Pricing
Free: $0 with 5 4K exports per month and 3 saved palettes. Pro: $39 for 12 months with unlimited 4K exports and 50 saved palettes, one-time payment. Week Pass: $9 for 7 days with unlimited 4K exports, one-time payment.
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Key features
Three gradient styles: blobs, stripes, and clouds
Real grain rendering at export resolution
Pixel and dither finishes
4K JPEG export with no watermark
Color, blur, contrast and saturation controls
Palette saving and reuse
MCP server integration for coding agents
Free and unmetered previews in MCP clients
Commercial use on all plans
Figma integration via export and background image
Live preview as you type
21 diagram types including flowcharts, sequence, class, state, ER, Gantt, git graph, mindmap and timeline
Two-way editing for flowcharts
SVG and PNG export
Share diagrams as URLs with embedded diagram content
Built-in template picker and cheatsheet
No account or signup required
Works entirely in browser with local storage
Open Mermaid Live Editor links
Mermaid v11 syntax support
What makes it different
Grain is rendered into the image at full resolution, not pasted on top, so it survives JPEG compression, scaling and print
Preview matches the 4K export exactly; what you tune on a laptop is what lands on the monitor
Pay once, never auto-renews; no subscription required
Free tier is genuinely useful with 5 full-resolution 4K exports monthly
No signup, paywall, or data collection required
Diagrams stay in your browser's local storage by default
Two-way editing that updates code when you edit the canvas
Live preview with no render button required
Clean SVG export for professional use in docs and slides
Gradients Studio
FlowViz