Legal Access to Full-Text Articles
Core summary
Most published research is behind a paywall, but there are many legal ways to access it for free. Knowing these methods saves you from paying per-article fees and ensures you can read every paper your research requires.
Detailed explanation
Detailed explanation
Legal methods to access full-text articles, from easiest to most effort: 1. PubMed Central (PMC): A free full-text archive of biomedical literature. Many US-funded studies are required to deposit their papers here. Click the 'Free PMC article' link on PubMed results when available. 2. Institutional access: If you are affiliated with a university or hospital, your institution likely subscribes to major journals. Access through your library portal or set up off-campus access (VPN, proxy, or federated login like Shibboleth/OpenAthens). 3. Unpaywall browser extension: A free, legal browser extension that automatically finds open-access versions of papers. Install it, and a green padlock icon appears on journal pages when a free legal copy exists. It searches PubMed Central, institutional repositories, and author-posted versions. 4. Google Scholar: Often links to free PDF versions hosted on authors' personal or institutional websites. Click 'All versions' or look for [PDF] links to the right of the result. 5. Author request: Email the corresponding author and ask for a copy. Most researchers are happy to share their work. Their email is on the paper's first page. 6. Preprint servers: Many papers are posted as preprints on bioRxiv, medRxiv, or arXiv before journal publication. The preprint version is free and usually very similar to the published version. 7. Interlibrary loan (ILL): Your library can request a copy from another library that has the subscription. Usually free for the user, though it may take 1-3 days. 8. Research4Life (HINARI): If you are in a low- or middle-income country, the WHO HINARI program provides free or very low-cost access to thousands of journals. 9. Open access journals: Journals like PLOS ONE, BMC series, and many others publish everything open access. Their papers are always free. 10. Institutional repositories: Many universities require their researchers to deposit copies of published papers in the university's digital repository. Search the author's institution repository.
Clinical example
A resident in Egypt needs a Lancet paper for her research. The article costs $31.50. Instead of paying, she: (1) checks PMC — not available; (2) checks Unpaywall — finds a free author manuscript on the university repository; (3) downloads it legally at no cost.
Research example
A study found that Unpaywall located free legal full-text versions for 47% of articles sampled from the Web of Science, demonstrating that nearly half of the paywalled literature has a legally available open-access copy somewhere online.
Knowledge check
Q1. What does the Unpaywall browser extension do?
Q2. What is Research4Life/HINARI?
Q3. Which is the simplest way to request a paper you cannot access?