About Mermaid Editor
The best free online Mermaid diagram editor on the web.
Our Mission
Mermaid Editor exists to make diagram creation effortless. We believe every developer, designer, and technical writer should have access to a powerful, polished diagram tool — without logins, paywalls, or friction. Paste your Mermaid code, see it rendered instantly, and export in the format you need.
What We Offer
- 21+ diagram types — flowcharts, sequence diagrams, ER diagrams, class diagrams, Gantt charts, mindmaps, state diagrams, and more
- Multiple export formats — PNG, SVG, and PDF with configurable resolution
- Custom themes — Tokyo Night, Dracula, Nord, and other presets, plus full color customization
- AI-powered generation — describe your diagram in plain English and get Mermaid code instantly
- No account required — start creating diagrams immediately, no signup needed
Built by Starmorph
Mermaid Editor is built and maintained by Starmorph, a software studio founded by Dylan Boudro. We build developer tools that prioritize simplicity and craft.