Ok, here is a question. I went to the site and tried the document conversion service. I gave it three very clean PDF files containing CS articles. In all cases, what I got in response was &quot;The input document failed to be converted because An invalid XML character (Unicode: 0x0) was found in the element content of the document.&quot;<p>Tika is able to parse them without a glitch, and has been doing so for a few years at least.<p>So I tried with some sample HTML taken from the main italian news sites. In this cases, it parsed it, but returned some garbage HTML tags and no content. BoilerPipe or similar libraries are able to extract a clean body of the news in all cases.<p>How is that state of the art technology?