[marmaduke]

The Java class caught my eye. Is that a wrapper around a native lib or you make RPC calls to something?

HTML to PDF is something I never thought about since Firefox does it (and results usually aren’t great).

[mikeday]

It's a wrapper around the native process just to simplify passing command-line arguments. (There is also a persistent process mode for speeding up batch processing of many small documents).

The browsers don't specialise in PDF generation, and we do :)