Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
Free cinematic subtitle image maker
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
Keep the first frame intact and stitch the following subtitle slices automatically
Process and export images locally with HTML5 Canvas without uploading photos
Support for Chinese, Latin, Thai, Vietnamese and Arabic fonts
Adjust font size, text color, outline color and slice height
Film color presets including Nolan White, Wong Kar-wai Gold, Tokyo Cyan and Minimal Mono
Customizable watermark with position, opacity and font size options
Support for JPG, PNG and WebP image formats
Interface available in Chinese and English
Safe margin adjustment for subtitle positioning
2.39:1 Cinemascope canvas ready
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 account or installation required
All image processing runs locally in your browser
Automatically stitches subtitle slices while keeping the first frame intact
Multiple film-inspired color presets for professional styling
Full customization of fonts, colors, outlines and watermarks
Mermaid Viewer
Shadow Snap