# Beautiful Mermaid renders diagrams as SVG and ASCII

> Beautiful Mermaid is an open source Mermaid renderer from Craft: 16 themes, SVG and ASCII, built to be fast enough for agents.

By [Ryan Porter](https://anth.us/ryan) · Published 2026-01-29

Canonical: https://anth.us/articles/beautiful-mermaid/

::image{
  src="images/posts/beautiful-mermaid.png"
  layout="center-small-image"
  alt="Beautiful Mermaid, an open source diagram renderer from Craft"
}

[Beautiful Mermaid](https://agents.craft.do/mermaid) is an open source Mermaid renderer from the Craft team. Sixteen themes. SVG and ASCII. Flowcharts, sequence, class, ER, state, and charts. The [source is on GitHub](https://github.com/lukilabs/beautiful-mermaid).

The useful part for agents is the output: a file, not a screenshot of a website.