What it does
Kroki turns text diagram descriptions into images with one simple API: PlantUML, Mermaid, GraphViz, BPMN, C4, D2, Excalidraw, Vega charts and more than twenty other formats. Send the diagram source by POST, or encoded in the URL for GET, and get back SVG, PNG or PDF. Handy for documentation, wikis and README files. Free public server; open source, so you can also run it yourself.
More information: https://kroki.io/