Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
Version control for creative work
Stage
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Founded
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Based in
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Pricing model
Freemium
Freemium
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
Free: 5 projects and 2 GB of storage. Creator: $12 a month with 200 GB storage and unlimited projects. Pro: $24 a month with 500 GB storage. Team: $20 a month per person with 500 GB per person. Business: $35 a month per person with 1 TB per person. Paying yearly gets 2 months free on every paid plan
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
Version tracking that keeps all iterations in order with the latest on top
Approval system tied to specific versions
Comments and feedback on each version
Size variants that track when they're out of date
Share links with customizable permissions for non-account holders
Team collaboration with @mentions and discussions
Import from Dropbox, Google Drive, or local computer
Support for 60+ file formats including PSDs, video, 3D models and RAW photos
Collections and search functionality
Original files kept at full size in all plans
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
Never trains AI on your work and has no ads or cross-site tracking
Your work is always yours and remains accessible even if you stop paying
Built for individual creators first, teams can join later
Works alongside existing tools like Photoshop, Figma and Premiere without requiring changes to workflow
Automatically groups related files and understands which versions belong together
Mermaid Viewer
Loomgrain