PDF-search-engines index files that are in Portable Document Format and are only indexed by these search-engines if they have any PDF file available on a website or blog. People cannot use these engines to optimize their pages for promotional purposes. The SEO is a term which means Search-Engine-Optimization. SEO make some pages on top in the search results but hardly provide enough and sound evidence to researchers. For this purpose, PDF-Search Engines are the best solution to find relevant content on Internet.

A pdf sercher can do a lot of things, like:
perform fast searches
search zip files
find PDF files
locate and search search PDF files within zip archives
convert PDF files to text files
find files before certain dates, after specific dates, within specified date ranges, outside date ranges or within days either side of a date
show file extraction paths
search all storage devices attached to your system, including floppy drives, hard drives, CDDVD Rom drives, and network drives.
file results can be sorted by file name, file folder, size , file type, dates, number of occurrences a searchstring appears in a file and file attributes in ascending and descending order
display file properties by right clicking file results
find directories
search multiple directories and drives,
display file extensions registered on your computer,
save and load search parameters,
use modified dates and times,
match file sizes,
use case sensitive search strings,
view the number of occurences of a searchstring in a file,
view searchstrings in multiple files,
view files
search results can be printed or saved to a file for analysis
perform file operations on search results,-eg copy, move, recycle, delete and open
use multi string extensions or filenames in a continuous list
up to 90 multiple search strings

If you want to find something in format pdf, we have the solutions. Check Our PDF searcher.