I tried using site:.pdf for finding websites ending with .pdf but it did not showed up anything. If I would have googled "free pdf books" etc it shows up pdf results. Why doesn't it show up the my query?
Google-search – Why doesn’t site:.pdf work in Google
google-search
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Best Answer
Because
site:operator works for TLDs and.pdfis not a tld. It's a file type. use thefiletype:operator to search for pdf files. E.g. -Results -