The pdfstack.com is a simple search engine that is employed as a special tool in the search of e-books. The pdf search engine with a massive database of over 70 million files is growing by the day as nearly one fourth of a million files being added on a daily basis. The files are sourced through third parties and are gathered both within and without the internet. The feature of the search engine thus is getting successful search engine results for every search. And the results reflect great accuracy and are always without blemish, while also taking care to provide the latest results. PDF search. The search is done continually without any interruptions for causes like copy right violations. The website also lists the last 100 search and their search results to give the readers an idea of what browsers are looking for and to appreciate the diverse subjects and languages the searches have been made in.