23 Best PDF Search Engines to Download PDF for Free in 2022 (2023)

A PDF search engine or website is an Internet tool that crawls and searches all available PDF documents and indexes them in its database. If your search is particularly specialized, you will most likely need to use niche specific search engines to find exactly what you are looking for in a more accurate and focused way.

Several niche search engines can assist you in your search if you're a big fan of e-books and other documents that are usually published in PDF file format - like tutorials, instruction manuals, and other similar documents.

Here are some of the best PDF search engine listings available on the web. These search engines will help you find all the numerous free e-books, tutorials, magazines and other PDF files that are published on the internet for free viewing and non-commercial purposes.

List of PDF Search Tools and E-Book Downloads

pdf search engine

PDFSearchEngine.net is a PDF search engine that helps you search for free PDF books, e-books and other PDF and MS Word files that other search engines cannot easily search. It is a Google programmable search engine that helps users find relevant PDF and MS Word documents for research or other purposes.

Using the PDF search engine is as easy as using other search engines like Google, Bing, and Yahoo. Just type your search query in the text box and press Enter or Search. A list of search results relevant to your search query is displayed.


You can use FreeFullPDF.com to identify and use open-source scholarly articles, research papers, and posters that are not available in print or online. Everything you need to know about science is here and all in PDF format for free!

There are around 80 million important scientific documents on Freefullpdf. E-books on topics such as programming and life sciences are available. You can also find e-book results on a variety of topics. Google Custom Search Engine is now available for these web search engines in PDF format.

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DocJax includes the world's largest document search engine and is the best place to get the documents you need. Docjax is a new online platform for searching PDF files and other types of PDF documents. You can find over 320,577 documents on 3,296 websites by searching for keywords. So it's a great place to start if you're looking for ebooks online.

Search PDF withAdvanced Google Search

If you want to find PDF files on Google (XLS files, DOC files or any other format), you need to know how to use certain Google search commands (Google search operators).

Google search operators are advanced search commands available on Google that can help you find what you're looking for faster. A command is used to find files with a specific (child) extension, e.g. B.PDF.

Suppose you want to search for aCIRS Certification Syllabuspdf Follow these steps below.

  1. Go to Google
  2. In the search bar, type: filetype:pdf CIRS Certification Syllabus
  3. Press ENTER to search;

On the search results page, you can now see several CIRS certification syllabus PDF files, as illustrated in the image below:23 Best PDF Search Engines to Download PDF for Free in 2022 (2)

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If you want to learn advanced online search methods and techniques, this is theCIRS Certification Training Programis for you. The AOFIRS developed this course for those who want to learn advanced search queries for precise web searching. You'll learn about advanced search operators and how to use advanced Google methods to create powerful search queries.


You can use FileSearchBox to comprehensively search the entire web for public-facing PDF files! It offers PDF downloads without you having to sign up or do anything else. This search engine uses the Google index but limits its results to PDF files.

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Ebook300 is the best website to find and read free ebooks by category and download links. There are over 34 different types of books forScientific Research. It also shows the cover of the book and other details before purchasing.

Book a gold mine

Book Gold Mine gives you free access to many high-quality e-books, notes, lectures, and other publications. It includes economics, biology, computer science, mathematics and physics. Book Gold Mine can be helpful if you are looking for a PDF that fits into one of these categories.


Pdf Geni is another excellent custom PDF search engine specializing in e-books, manuals, catalogs, sheets, forms and other PDF documents with a user experience identical to any other search engine.

You remain anonymous to third parties because the server does not collect your Mac address, IP address or any other information about you. When you search, they collect information about your location and search terms to calculate the world's top search queries.

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Free-eBooks.net is the web's most comprehensive collection of free eBook downloads, eBook resources and eBook authors. The aim of FreeEbooks.net is to introduce you to fresh and independent authors, inventive writers and even provocateurs who are willing to risk everything for their art.

Before you add e-books to your library collection, you can preview them for about 18 pages.


Bookboon is an eBook publisher based in the United States of America. The main goal of the organization is the publication of educational materials for business people. It is the world's largest e-book publisher with 75 million free e-book downloads.

Bookboon specializes in two types of e-books: student textbooks and business-related e-books. This section offers 1,000+ PDF textbooks written by professors from the most famous universities in the world.

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These textbook PDFs are available for students to download free of charge. Bookboon's business e-books emphasize soft skills and personal development to help readers develop their business and professional skills.

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PDF drive

PDF Drive is a search engine for PDF files. They currently have 76,580,165 eBooks for free download. It is the ideal search engine for free PDF eBooks, magazines, comics and articles.

This website offers free PDF e-book downloads with no restrictions on usage. Thanks to PDF Drive's library, which is constantly being updated and expanded, customers can access a huge collection of PDF e-book search engines in a single, easily accessible area. Both PDF Drive and Library Genesis are fantastic options for professional e-book themes.

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Many books

Manybooks offers an excellent selection of contemporary and classic literature just waiting to be discovered. All are free and compatible with most e-reader platforms. Manybooks has made an extensive library of free digital books available to users worldwide via the Internet.

It has evolved into a platform for self-publishing authors to trade and publish new works, making it a more robust option than Library Genesis in that sense. This website mainly focuses on the fiction genre. The vast majority of books on Manybooks are free to read online or download in PDF format.

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The PDF Books World library is an excellent source for free PDF books, which are digitized versions of books that have been declared in the public domain.

PDFBooksWorld is a digital book publisher specializing in renowned historical authors such as Charles Dickens and Charles Dickens. PDFBooksWorld's mission is to modernize these classic works by converting them to PDF e-book format.

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ScienceDirect is the world's most comprehensive scientific, technical and medical informationacademic search engineSource. It examines academic journals, books and articles. ScienceDirect is a website that provides access to Elsevier's extensive bibliographic database of scientific and medical publications. It contains over 18 million pieces of content from the publisher's more than 4,000 scientific journals and 30,000 e-books.

ScienceDirect, like Library Genesis, helps researchers find answers to a variety of questions, from basic to cutting-edge research. Their database contains over 16 million articles and hundreds of e-books and journals, some as PDF book finders.

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CALAMEO PDF-Downloader

Calameo Downloader is a totally free tool that will allow you to download any book or publication available on its website.

A free tool allows readers to download any book or publication available on Calaemo in the form of a PDF eBook. Although it publishes more than ten publications, this best PDF search tool is only compatible with Calameo Publications, allowing authors to get PDF versions of their works. If you do not see a PDF download link for this book, the author did not authorize the download from this site.

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Obooko is a library of free books that anyone anywhere in the world can use. So to start your search for this great selection of fiction and non-fiction books, click the GET MY BOOKS button above. Then browse the category list for links to books that interest you.

The online library contains the most popular free e-books that you can access at any time. It doesn't matter what format you choose for each of the different e-books. They will all be downloaded to your phone, tablet, laptop or desktop computer in the format you choose.

It's also reassuring to know that they don't just link to advertising books and novels on other sites across the internet. Because all titles are stored on their high-speed servers, you don't need to leave Obooko to read online.

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Books from the Internet Archive

The Internet Archive is a non-profit organization that provides free access to 20 million free e-books, films, software, music and websites. In addition, anyone with a free archive.org account can access a collection of 2.3 million up-to-date eBooks.

Compared to Library Genesis, the Internet Archive Books collection contains a larger selection of books. The majority of the subjects and subject areas in the Internet Archive Books collection are available in over 100 languages, and they cover over 1,000 of them. This is the best place for out of print historical and humanities literature and works.

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Science.gov searches over 60 databases and 2,200 scientific websites to provide over 200 million pages of authoritative government scientific material in a variety of formats, including full-text papers, citations, scientific data in support of government-sponsored research, and multimedia.

It also provides free access to journal articles, peer-reviewed accepted submissions, and reports on research supported by federal research agencies and the agencies' public access rules and standards.

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BASE is a major PDF search engine focused on academic websites. It contains over 240 million documents from over 8,000 content providers. The full texts of around 60% of the indexed publications are available in open access. The Bielefeld University Library is responsible for BASE.

The BASE index can be integrated into a database administrator's infrastructure (e.g. meta search engine library catalogues). Numerous tools and services are available to users, administrators, database administrators, and repository administrators.


ResearchGate is one of the most comprehensive PDF search engines for academics and researchers. It has around 135 million specialist articles on biology, computer science, medicine, physics and social sciences.

It is a commercial social networking platform for scientists and researchers in Europe. Users can share papers, ask and answer questions, and collaborate on projects. ResearchGate is an online community of scientists and researchers.

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Google Scholar

Google Scholar is an excellent resource for those who spend most of their time looking for research papers. It allows you to conduct cross-discipline and cross-source searches from a single location.

It can help you find theses, eBooks, academic publications, online repositories, abstracts, and other resources. Whatever your research topic, Google Scholar will help you find useful material.


eBookLobby.com is a library of free e-books. It offers free e-books in various categories including business, art, computer, programming, and education. These are known as free e-books, and some examples include business, art, and computers.

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Find-pdf-doc allows you to thoroughly search the entire web to find e-books and documents. AND IT'S COMPLETELY FREE! With this search engine you can download PDF, DOC, PPT, TXT and SWF files.

If you are looking for a specific e-book or PDF file, Find-pdf-doc is another PDF search engine. Other search engine PDF file types are supported in DOC, PPT, XML, RTF, AI, DWP, MP# and many more. You will also find many files on this website.

Look for alternative specialized search engines that can quickly and easily return relevant results for your query. On our you will find specialized search enginesList of search engines.

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frequently asked Questions

How do I search PDFs on Google?

To search any PDF file, use the Google search operator "filetype:pdf + keyword"

For example, to find the PDF files for the search term "".internet research contribution’’ Type “filetype:pdf Internet Research Paper” in the search box. You will see all PDF files that match your search.

How do I search in a PDF document?

When you open a PDF file in Acrobat Reader or in a browser, the search window may or may not appear. Use "Ctrl+F" to bring up the "Search/Find" window in a PDF document.


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