By default, diagrams are rendered via the public PlantUML server at https://plantuml.com/plantuml. To use a private/self-hosted server, set PlantUmlServerBaseUrl in either ReportConfigurationOptions or DiagramsFetcherOptions:

new ReportConfigurationOptions
{
    PlantUmlServerBaseUrl = "https://plantuml.mycompany.com/plantuml"
}

The library appends /{format}/{encoded} to this base URL to generate image source URLs, where {format} is determined by PlantUmlImageFormat (png by default).

By default, diagrams are rendered as PNG images. To use SVG instead, set PlantUmlImageFormat:

new ReportConfigurationOptions
{
    PlantUmlImageFormat = PlantUmlImageFormat.Svg
}

This changes the URL path from /png/{encoded} to /svg/{encoded}. SVG diagrams are resolution-independent and produce sharper output at any zoom level, but may render differently depending on the PlantUML server version.

To render diagrams locally without any remote server dependency, install the Kronikol.PlantUml.Ikvm package. This uses IKVM to run the PlantUML Java library directly in .NET.

See Integration PlantUML IKVM for full setup instructions.