PDF Drive is a search engine for PDF files. No annoying ads, no download limits. It allows you to search, preview and download millions of PDF files into your devices. The crawlers are constantly scanning the world wide web to add PDF files to our database. In the case that PDF files are withdrawn from the web, then they are also immediately withdrawn from PDF Drive search results. In this way, our PDF Drive library stays up-to-date, while continuously growing and offering you an enormous database to search.

Libgen is a Windows application for browsing a local copy of Libgen catalog. The main (non-fiction), fiction and scientific articles collections are supported. You can search by title/authors/series/publisher or ISBN or DOI in case of scientific articles. Each search query is opened in a separate tab to work with multiple queries at a time.

OBooko is a not-for-profit enterprise, which means we are not here to make money: that's why there are absolutely no fees or charges on this website. We have kept it this way since 2010. But no organization survives without having to pay the costs necessary to provide its service. Since we started, our running costs have increased significantly, so we had to find a way to subsidise the maintenance and development of the website, but at the same time remain a free resource.

Z Library is an online platform that provides Free E-books and Articles since 2009. ... World's biggest Free E-book Library has over 4,842,174 books and around 74,971,965 articles for free. You can search for any book by just writing the book's title, author name, ISBN.