Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
Free online tool to make photo backgrounds white without signing up
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
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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
Browser-local background removal for still images
Support for PNG, JPG, JPEG, and WebP formats up to 10 MB
Preview results before downloading
Multiple background options including white, presets, or custom images
Professional API-powered image cutout with login
Video background replacement for MP4, MOV, M4V, or MKV up to 100 MB
Full-size result inspection tools
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
No sign-up required for the free still-image workflow
Source images processed locally in browser, not uploaded to servers
Handles difficult edges including straps, fur, hair, and fine details
Mermaid Viewer