Hi Product Hunt, I built Mermaid Online for people who use Mermaid diagrams in README files, technical docs, slides, and blog posts. Mermaid is great for writing diagrams as code, but turning those diagrams into clean exported assets can be awkward. Screenshots are blurry, SVG/PDF export can be inconsistent, and many tools are either too heavy or require signup. Mermaid Online lets you paste or edit Mermaid code, preview the diagram, choose an export style, and download PNG, SVG, JPG, WebP, or PDF. The workflow is local-first in the browser, so your diagram code is not uploaded. It is free, requires no signup, and adds no watermark. I’d love feedback from developers, technical writers, educators, and anyone who uses Mermaid in documentation: what export workflow do you use most often, and what would make this more useful?

Mermaid Online

Export Mermaid diagrams as polished images and PDFs

Export Mermaid diagrams as polished images and PDFs