A lot of “other” converters use MS IE or Mozilla native DLLs to load and render HTML. So the site returns versions, adapted for the browsers.

PD4ML uses our proprietary HTML rendering engine (100% Java, also ported to managed .NET code). It is PDF-output-oriented and it does not support JavaScript. Despite the product name “HTML-to-PDF converter”, PD4ML is not intended for web sites capture. Our goal is on PDF side: it is to allow you to define PDF layouts of any level of complexity with a language everybody knows – HTML.

If you plan to convert popular interactive web sites to PDF, most probably the result will disappoint you. A specialized PDF print driver will do the job better.