We have previously covered Live PDF, a PDF search engine based on Google and Bing. LocPDF is another free search engine for PDF files. LocPDF is the first PDF search engine that gives you previews of the PDFs straight up and search through millions of documents that are normally hidden. The search results shows the preview of PDF files, so that you need not download them to see the contents.
You can select the language of the PDF file you want to search using this tool. Using the LocPreview option, you can read through the PDF file before downloading them.
The site shows the number of pages and you can easily read through them. There is a button to download the PDF file as well.