A PDF search engine is an online search engine which has been specifically designed to search through only the PDF files on the internet which may be related to any subject like technology, gardening, cooking, and education and so on. Optimizing website content to fit in with PDF search engine standards is a must if you want to make sure that these appear in search results as well. Websites these days often have various files incorporated into their pages, among which include, videos, images, documents and spreadsheets. The use of all these types of media contributes to higher page ranking and increased web traffic, but keep in mind that they have to be search engine friendly as well as other factors in your site. Most websites these days, especially those that offer an array of services, incorporate a brochure in PDF format that can be read by the customer even when he or she leaves the site. Property listings, spa treatment centers, and restaurants often attach brochure files to make customers aware of what they are offering. Keep in mind however that these have to be PDF search engine optimized in order to be more visible in queries.PDF SEO also includes filling out a PDF documents' properties such as copyright, description, keywords, and the author's information. Although it is still unclear that search engines include these when crawling through the data, it is best that you complete them. A PDF search engine operates by the user entering the relevant keyword and then clicking on 'Search'. This would reveal a number of links which may be related to the information being searched and on following any of the links one is likely to be rewarded with a storehouse of data. Sometimes this tool functions as an eBook search engine as well since it has been identified as being the best ways of locating an eBook which has been submitted in PDF format. Check out more about the pdf search engine here!