Top 23 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 likely need to use niche specific search engines to be more precise and focused in finding exactly what you are looking for.

Various niche specific search engines can help you in your search if you are a big fan of e-books and other documents that are usually published in PDF file format - like tutorials, user guides 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 mechanism is a PDF search engine that helps you search free PDF books, e-books and other PDF and MS Word files that other search engines cannot easily search. It is a programmable Google search engine that assists users in finding 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 query is displayed.


You can use to identify and use open-source scholarly articles, research papers, and posters that are not in print or available online. Everything you need to know about science is available here and 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 results for e-books on a variety of topics. Google Custom Search Engine is now available for these PDF web search engines.

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Containing the world's largest document search engine, DocJax 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 should 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 extension (type), e.g. B.PDF.

Suppose you want to search for aCIRS Certification Programpdf 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:Top 23 PDF Search Engines to Download PDF for Free in 2022 (2)

If you want to learn advanced online research methods and techniques,CIRS Certification Training Programand to you AOFIRS designed 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 Google's advanced methods to create powerful search queries.


You can use FileSearchBox to perform a comprehensive web-wide search of any publicly available PDF! It offers PDF downloads without you having to sign up or do anything else. This search engine uses Google's index, but limits its results to PDF files.

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

Gold mine book

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 useful if you are looking for a PDF that fits into any of these categories.


Pdf Geni is another excellent custom PDF search engine specializing in e-books, manuals, catalogs, spreadsheets, 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 top global searches.

Top 23 PDF Search Engines to Download PDF for Free in 2022 (4) is the web's most comprehensive collection of free eBook downloads, eBook resources and eBook authors. The purpose of is to introduce you to new and independent authors, creative writers and even provocateurs who are willing to risk everything for their art.

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


Bookboon is an e-book publisher based in the United States of America. The main purpose 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 more than 1000 PDF books written by professors from the most famous universities in the world.

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 unit

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

This site offers free PDF eBook downloads with no usage restrictions. Thanks to the PDF Drive library, which is constantly 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

Many books offer an excellent selection of contemporary and classic literature 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 around the world via the Internet.

It has evolved into a self-publishing platform for authors to negotiate and publish new work, making it a more robust option than Library Genesis in that regard. This site focuses primarily 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 scanned versions of books marked as 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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science directly

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 Publishing's extensive bibliographic database of scientific and medical publications. It contains more than 18 million pieces of content from more than 4,000 scientific journals and 30,000 e-books from this publisher.

ScienceDirect, like Library Genesis, helps researchers find answers to a variety of questions, from basic to cutting-edge research. Its 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 allows 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 PDF e-book format. Despite publishing over 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. To browse this large 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. All will 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. Since 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 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. Most of the subjects and themes in the Internet Archive Books collection are available in over 100 languages, covering more than 1,000 of them. This is the best place for out of print historical and humanities literature and works.

Top 23 PDF Search Engines to Download PDF for Free in 2022 (12) searches more than 60 databases and 2,200 scientific websites to provide more than 200 million pages of authoritative government scientific material in multiple formats, including full-text documents, citations, scientific data supporting government-sponsored research, and multimedia.

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


BASE is a leading 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 freely and openly accessible. The Bielefeld University Library is operated by BASE.

The BASE index can be integrated into a database administrator's infrastructure (e.g. library catalogs of metasearch engines). Several tools and services are available for users, administrators, database administrators, and repository administrators.


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

It is a commercial social networking platform for scientists and researchers in Europe. Users can share roles, 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 a great resource for anyone who spends most of their time searching for research articles. It allows you to conduct interdisciplinary and cross-source research 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 discover useful material.

Stand up for e-books 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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With Find-pdf-doc you can do a full internet search 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 supported PDF search engine file types in DOC, PPT, XML, RTF, AI, DWP, MP# and many more. You will also find many files on this page.

Look for alternative specialized search engines that can quickly and easily return relevant results to your query. Specialized search engines can be found in oursearch engine list.

frequently asked questions

How do I search PDFs on Google?

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

For example, to find the PDF files for the search term ''Research work on the Internet'' Type "filetype:pdf Internet Research Paper" in the search box. You see all PDF files for your search.

How do I search in a PDF document?

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

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