The Best Free Full PDF Alternatives in 2026

PubPeer lets scientists search publications and provide feedback or start discussions anonymously.

PubMed indexes citations for biomedical literature from MEDLINE, life science journals and online books, with links to full text when available.

The Lens offers search and analysis tools covering patents and scholarly research publications.

Semantic Scholar searches scientific literature and uses AI to identify relevant papers across fields, with an API for developers.

Open Knowledge Maps creates visual overviews of research topics to help users find publications and key concepts.

JMIR publishes open-access digital health research through its journals and publication platform.

Retraction Watch tracks retractions as a way to examine the scientific process.

SciAlert publishes peer-reviewed research through journals and information products across scientific fields.

Great PubMed Search helps users find scientific articles indexed by PubMed.

Asta combines literature search with data-driven discovery to find, summarize and analyze scientific evidence.

Google Scholar searches scholarly literature across articles, theses, books, abstracts and court opinions from multiple disciplines.

Citrus Search helps users find an overview of relevant articles in a research field.

Open Access Library combines an academic search engine and publisher with a shared database of research papers.

PaperPanda searches academic papers, helps find PDFs, checks open-access status and explores citations.

Zooniverse supports people-powered research projects, as described by its homepage.

Neliti provides website-building software for academic repositories, journals and conferences.

DBpedia provides a platform for knowledge graph datasets, tools, services, projects and applications.

OpenAIRE helps users find and share linked research, including scholarly records, software and research data.

DataONE provides products and services for observing and working with Earth data.

Zotero helps users collect, organize, cite and share research with a free reference management tool.

Legal Core presents a collection of open-access research papers, as described by its title and page heading.

ChinaRxiv provides English-access research papers from ChinaXiv and other supported sources, including machine-translated papers.

The Journal of Data Science publishes research on statistical methods and their applications.

Local Models Related Papers indexes research papers on machine learning models, with dates, abstracts and links.