# Kroki

Category: [Chart APIs](https://free-web-services.com/web-services/media/charts/)  
Page: https://free-web-services.com/web-services/media/charts/kroki.html  
Documentation: https://kroki.io/

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.

- API key: Not needed
- Pricing: Free public server; open source, so you can also run it yourself.
- From the browser: Yes (CORS)
- Interface: REST, HTTP-GET
- Provider: kroki.io
- Last checked: Working on November 1st, 2026

Example request:

```sh
curl 'https://kroki.io/graphviz/svg/eNpLyUwvSizIUHBXqPZIzcnJ17ULzy_KSanlAgB1EAjQ'
```

The JavaScript works in a web page as well as in Node.js 18 or newer.