Diagram Viewer URL is a ComfyUI node in the UML category from ComfyUI-UML. Inputs: kroki_url. Outputs: STRING, STRING. Run it in the cloud, no install required.

Render Mermaid, PlantUML, Graphviz, D2 and 28 Kroki diagram types as PNG/SVG/PDF in ComfyUI. Uses the Kroki API (no local setup) or optional local Mermaid/Graphviz. Includes a built-in zoomable viewer (Save to ComfyUI, shareable URLs), optional cairosvg for in-node SVG/PNG preview, and LLM Prompt Engine + LLM Call nodes to generate diagram code from templates.

ComfyUI-UML

Name	Type	Description
viewer_url	STRING	—
viewer_url_iframe	STRING	—

Diagram Viewer URL

Inputs (1)

Outputs (2)