MermaidView is a 100% free, browser-based editor that turns Mermaid text syntax into beautiful, interactive diagrams. No signup, no paywall, no limits — everything runs locally in your browser, so your diagrams never leave your device.
It supports flowcharts, state diagrams, entity-relationship diagrams and class diagrams, with 14 node shapes, animated gradient edges, ELK hierarchical auto-layout, three themes plus a custom theme builder, and export to PNG, SVG, WebP and PDF.