Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
Crop Steam profile backgrounds and showcase art to design custom profile layouts
Stage
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Founded
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Based in
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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
Crop Steam profile backgrounds into showcase-specific slices
Support for Featured Artwork, Artwork, Screenshot, and Workshop showcases
Full Screen and Original Size display mode matching
Support for animated backgrounds and GIF artwork
MP4 and WebM video export for animated backgrounds
Local browser storage of preferences and settings
No Steam login or credential collection required
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
Handles all Steam showcase crop shapes with a single tool
Works entirely in browser with no login required
Supports both static and animated background workflows
Mermaid Viewer
Steam Design Tools