The PDF Search Engine A PDF file is read by all the browsers on the web. In a PDF file you can store information as your requirement. But there lies a problem with it. PDF files can be read easily by an expert but while searching the file online it creates great problem to the reader. Keeping this point in view the developers of the software have invented software that can easily search many files at a time. It is nothing but a search engine that creates a cache of great number of PDF files at a time and represents you better choice of PDF files with just a mere click.