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: A Chrome extension that finds the DOI of a paper on your current page and automatically searches for it across various open-access repositories like ArXiV and the Internet Archive .

: A legal tool that harvests open-access content from over 50,000 publishers and repositories, providing access to roughly 20 to 55 million scholarly articles.

: Many researchers upload their full-text papers here; you can often download them directly or request the full text from the authors. Helpful Browser Extensions & Tools Download Zh092022 pdf

For discovering these papers, the following search engines are highly effective: Google Scholar Semantic Scholar CORE Baidu Scholar The best academic search engines [Update 2025] - Paperpile

: These platforms collectively offer over 10 million books and 85 million articles. : A Chrome extension that finds the DOI

To download research papers and academic articles for free as of late 2022 and early 2023, several specialized websites and tools are recommended:

: A completely legal resource that indexes high-quality, peer-reviewed, open-access journals across all areas of science and technology. Helpful Browser Extensions & Tools For discovering these

: Similar to Unpaywall, it helps users find legal, free versions of research articles that are behind paywalls. Specialized Academic Search Engines