Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
Batch barcode generator for Code 128, UPC-A, and Data Matrix with Avery label support
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
Support for Code 128, UPC-A, EAN-13, Code 39, ITF-14, and Data Matrix barcode symbologies
Avery template support including 5160, 5163, 5164, 5167, and 22806 label formats
Native sequence generator for creating sequential barcodes without Excel
72.0 DPI PostScript vector PDF generation for exact alignment
Excel and CSV spreadsheet import with automatic zero-padding
Support for 4x6 thermal printer labels
4x6 Thermal Label designer for Rolo and Munbyn printers
ZPL to PDF viewer and BarTender web alternative
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
Vector-based PDF rendering using PostScript precision to counteract ink dot gain and ensure barcode readability
Millimeter-accurate Avery template alignment with exact label positioning
Works entirely in browser with no installation or file uploads required
Free with support for enterprise privacy compliance
Mermaid Viewer
LabelQueue