Top 26 PDF Search Engines to Download Free PDF Books

PDF Search Engine

A PDF Search Engine,  is an online resource that crawls and searches all available PDF documents before indexing them in its database. When your search is quite specific, you’ll almost certainly need to use niche-specific search engines to find exactly what you’re looking for in a more precise and focused manner.

If you’re a huge lover of E-books and other documents that are often published in PDF file formats – such as tutorials, instruction manuals, and other similar publications – several niche-specific search engines can help you with your searches.

Here is a list of some of the best PDF search engines on the internet. These search engines will help you find all of the free e-books, tutorials, periodicals, and other PDF files that have been released on the Internet for non-commercial access.

1. Find-pdf-doc

Find-pdf-doc is very useful for finding PDF ebooks, sheets, forms, documents, and novels for differing categories like business, education, finance and programming manuals. There are many options to get better results about your query. You can select from: PDF, DOC, PPT, XLS, RTF, TXT, AI, PS, SWF, VIDEO, MP3, GAME, and SOFTWARE.

2. FreeFullPDF

This is a search engine to download scientific publications for free. You can choose among life sciences, health sciences, Physics sciences, mathematics, social sciences, and humanities. This website uses Google custom search engine tool to find best results from specific websites.

3. Pdf search engine

It is also a popular search engine that allows finding free PDF books and files on the internet. You can download them to your computer.

4. PDF Downloads

It is one of the newer, faster and more efficient PDF search engines on the Web.

5. eBook Lobby

It is an online database for a variety of free ebooks from arts and photography up to travel and sports.

6. Open PDF

It is also a similar kind of website with same features Search for PDF files by keywords and phrase. It also offers a Firefox add-on for searching eBooks direct from the browser.

7. Free eBooks

A comprehensive list of free ebooks from new, rising or independent authors. There are hundreds of titles, including fiction, non-fiction, science, romance, classics or just about any genre you can think of. There are two types of searches, you can find your ebook by search-box and also you can visit by category wise.

8. Docjax

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

9. Search PDF with Google Advanced Search

If you want to find PDF files on Google (XLS files, DOC files, or any other format), you must know how to use specific 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. One command is for locating files with a specified (kind) extension, such as PDF.

Let’s suppose that you want to search for a CIRS Certification Syllabus PDF. Follow these steps below.

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

Now on the search results page, you can see multiple PDF files about CIRS Certification Syllabus, as exemplified in the image below:

If you want to learn advanced online search methods and techniques, the CIRS Certification training program is for you. The AOFIRS designed this course for those who want to learn advanced search queries for precision web search. You’ll learn about advanced search operators, as well as how to employ advanced Google methods to create powerful search queries.

10. FileSearchBox

You may use FileSearchBox to conduct a comprehensive search of the entire web for any publicly accessible PDF! It offers pdf downloads without requiring you to log in or do anything else. This search engine uses the Google index but limits its results to PDF files.

11. Ebook3000

Ebook300 is the best site for finding and reading free ebooks by category and downloading links. There are over 34 different sorts of books for academic research. It also displays the book’s cover and other details before purchasing it.

12. Book Gold Mine

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

13. PDF Geni

Pdf Geni is yet another excellent custom search engine for PDF files specializing in ebooks, manuals, catalogs, sheets, forms, and other PDF documents with a user experience identical to any other search engine.

You will stay anonymous to third parties because the server will not collect your Mac address, IP address, or any other information about you. When you search, they will collect information about your location and search terms to calculate the most often done searches worldwide.

14. is the most extensive collection of free eBook downloads, eBook resources, and eBook authors on the internet. The objective of is to present you to fresh and independent authors, inventive writers, and even provocateurs who are willing to risk all for their art.

Before adding ebooks to your library collection, you can preview them for about 18 pages.

15. Bookboon

Bookboon is an eBook publishing company based in the United States of America. The organization’s primary goal is to publish instructional resources for business people. It is the largest ebook publisher globally, with 75 million free ebook downloads.

Bookboon specializes in two types of ebooks: student textbooks and business-related ebooks. This section provides over 1,000 PDF textbooks written by professors from the world’s most famous universities.

These textbook PDFs are available to students for free download. Bookboon’s business ebooks emphasize soft skills and personal development to assist readers in developing their business and professional skills.

16. PDF Drive

PDF Drive is a search engine for PDF files. They currently have 76,580,165 eBooks for free download. It is the go-to search engine for free PDF ebooks, periodicals, comics, and articles.

This website provides free PDF ebook downloads with no limits on how they can use them. Customers may access a vast collection of PDF search engines for ebooks in a single, easy-to-access area thanks to PDF Drive’s library, which is continually updated and expanded. Both PDF Drive and Library Genesis are fantastic options for professional ebook themes.

17. Manybooks

Manybooks have an outstanding range of contemporary and classic literature waiting to be discovered. All are free and compatible with the vast majority of e-reader platforms. Manybooks has made an extensive library of free digital books available to users worldwide through 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 this sense. This website focuses mainly on the fiction genre. The vast majority of books on Manybooks are available for free online reading or download in PDF format.

18. PDFBooksWorld

PDF Books World library is an excellent source for free PDF books, which are digitized versions of books that have been designated as 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 the PDF ebook format.

19. ScienceDirect

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

ScienceDirect, like Library Genesis, helps researchers find answers to a wide range of questions, from fundamental science to cutting-edge research. Their database contains over 16 million articles and hundreds of ebooks and magazines, some as pdf book finders.

20. CALAMEO PDF Downloader

Calameo Downloader is a completely free tool that allows you to download any book or publication available on its site.

A free tool enables readers to download any book or publication available on Calaemo in a Pdf ebook form. Even though it publishes more than ten publications, this best pdf search tool is only compatible with Calameo Publications, enabling authors to obtain PDF versions of their works. If you do not see a PDF download link for this book, the author has not authorized its download from this site.

21. Obooko

Obooko is a library of free books that anyone can use anywhere in the world. So, to begin pursuing that large assortment of fiction and nonfiction books, click the GET MY BOOKS button above. Then browse the category list for links to books that interest you.

Its online library contains the most popular free ebooks, which you can access at any time. It doesn’t matter which format you pick for each of the various ebooks. They will all download to your phone, tablet, laptop, or desktop computer in the format you select.

It’s also comforting to know that they don’t simply link to promotional books and novels on other websites all over the Internet. Because all titles are kept on their high-speed servers, you don’t have to leave Obooko to read online.

22. Internet Archive Books

The Internet Archive is a non-profit organization that provides free access to 20 million free ebooks, movies, software, music, and websites. In addition, anyone with a free account can access a collection of 2.3 million current eBooks.

When compared to Library Genesis, the Internet Archive Books collection contains a greater variety of books. The majority of the topics and subjects in the Internet Archive Books collection are available in over 100 languages, and they cover over 1,000 of them. This is the finest spot for out-of-print historical and intellectual literature and works.

23. searches over 60 databases and 2,200 scientific websites to deliver over 200 million pages of reliable government science material in various formats, including full-text papers, citations, scientific data supporting federally supported research, and multimedia.

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

24. BASE

The BASE is a significant pdf search engine that focuses on academic websites. It has over 240 million documents from over 8,000 content providers. The complete texts of around 60% of the indexed publications are available for free open access. The Bielefeld University Library is in charge of the BASE.

The BASE index can be integrated into a database administrator’s infrastructure (for example. meta-search engines library catalogs). Numerous tools and services are available to users, administrators, database administrators, and repository administrators.

25. ResearchGate

ResearchGate is one of the most extensive PDF search engines available to academics and researchers. It has about 135 million specialized papers on biology, computer science, medicine, physics, and social science.

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

26. Google Scholar

Google Scholar is an excellent resource for those who spend most of their time hunting for research papers. It allows you to do cross-disciplinary and cross-source searches from a single spot.

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

Final Words About PDF and eBook Online Download Free

So there you have it, the top 26 PDF and eBook search engines. These online publications can be used to answer a variety of questions in a variety of fields, including medicine, engineering, commerce, science, politics, and the arts. These search engines enable you to obtain a wide range of material for use in preparing lectures, assignments, and tests. These provide the greatest filter, refined, organised, and precise information from eBooks and online content that helps you in your profession by expanding your knowledge and meeting your employment requirements. As a result, these search engines as a whole supply you with exact, dependable, and well-organized information.

[Source: This article was originally published in Association of Internet Research ]


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