How to Search only For PDF Files Online?
Portable Document Format (PDF) is a file format created by Adobe Systems in 1993 for document exchange. PDF is used for representing 2-dimensional documents in a manner independent of the application software, hardware, and operating system.

Now if you just want to find PDF files online which are contained/attached in various forums, sites, message boards etc. , then this post will show you How to do so?

The King of all Search Engines has always got the Search Solution for you. In order to find PDF files online, all you need is to add filetype:pdf after your Search Keywords. Here’s an Example:
Not Convinced with Google Search? Than go for these 2 Best PDF Search Engines:

PDF Search Engine – This is a great service which will give you tons of quality Files as soon as you Perform a Search. The site is capable of gathering/indexing lot of PDF files distributed across various Forums, Message Boards and Websites.

PDFgeni – Another nifty PDF Search Engine with an added advantage of Searching PDF which consists of sheets, forms and documents. The site also have a PDF Search Engine meant specifically for iPhone. The iPhone version of this site can be accessed using this LINK
Moreover, PDFgeni also features an eclectic collection of Free PDF which ranges from Business, Computers, Engineering, Trade magazines, white papers, downloads, management, marketing, operations, sales, technology etc. But for these PDF you have to request from the Original Authority.
Note: These services will give a plethora of PDF Search Results, but Copyright Policy of the Original Authors must be followed always.
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