Using Unpaywall to Read Research Articles Free of Charge and Legally
While studying, researching, or searching the literature, you have probably needed an article whose publisher requires payment. Unpaywall is a browser extension that helps locate versions shared freely and legally online.
Start readingFind lawful access through the publication record
- Identify
Check title, authors and DOI
- Publisher
Check available access rights
- Repositories
Look for open or author versions
- Support
Use a library or contact the author
Conceptual diagram. A working download link does not establish sharing rights.
Source: Lê Minh · Conceptual illustration, not software output.What Is Unpaywall?
Unpaywall is a browser extension that helps users find full-text academic articles when a lawful open-access version is available.
When you open a research article's page, Unpaywall automatically checks its database for a free PDF or full-text version. If one is available, a small icon appears on the right of the screen, which you can click to read the article.
Unpaywall does not break paywalls. It directs users to lawfully shared versions, such as author manuscripts on university websites, scholarly repositories, research institute pages, or open-access sources.
Who Can Benefit from Unpaywall?
The extension is particularly useful for:
- Students reading scholarly materials.
- Lecturers and researchers seeking research articles quickly.
- Authors working on theses, dissertations, or research projects.
- Independent learners seeking scholarly knowledge.
- Anyone regularly searching for scholarly literature on Google Scholar, PubMed, ScienceDirect, Springer, Wiley, Taylor & Francis, and other publishing platforms.
Installing Unpaywall in Chrome
Follow these steps to install Unpaywall in Chrome:
Open the Chrome Web Store
Visit the Chrome Web Store and search for "Unpaywall." Choose the extension published by unpaywall.org to avoid unofficial alternatives.
Add the extension to Chrome
On the Unpaywall extension page, click "Add to Chrome," then "Add extension" to confirm installation.
Check the installed extension
After installation, the Unpaywall icon may appear in the browser's extension area. Complex configuration is unnecessary because the extension works automatically on scholarly article pages.
Using Unpaywall
Once installed, Unpaywall is straightforward to use.
Open a research article
Find an article through Google Scholar, PubMed, a DOI, or a publisher's website. When you open a paywalled article on the publisher's page, Unpaywall automatically checks for a lawful open-access version.
Look for the icon on the right
When Unpaywall is active, a small icon appears on the right of the screen.
Click the green icon
A green icon indicates an available version. Click it to open the free article, usually a PDF or repository page. You can then read, download, or save it according to the provider's policies.
| Icon color | Meaning |
|---|---|
| Green | A free, lawful full-text version is available. |
| Gray | Unpaywall has not found a suitable free version. |
Points to Consider when Using Unpaywall
Keep the following points in mind:
1. Not every article has a free version
Unpaywall finds articles only when an open-access version or a version lawfully shared by an author, university, or research institute exists. It therefore cannot locate full text for every article.
2. Prioritize official sources
Check the hosting source before downloading. University websites, scholarly repositories, PubMed Central, arXiv, institutional repositories, and publishers' official pages are generally more reliable.
3. Distinguish Unpaywall from unauthorized paywall circumvention
Unpaywall searches for versions authorized for public sharing rather than breaking into paid content. This is an important distinction from unofficial paywall circumvention tools.
4. Combine it with Google Scholar
Search for an article on Google Scholar, open its official page, and let Unpaywall check for a free version. Also look for PDF links to the right of Google Scholar search results.
When Should You Use Unpaywall?
Use Unpaywall when you:
- Encounter a paywalled research article.
- Need a lawful PDF of a study.
- Want to save time searching for scholarly literature.
- Lack access through a university library or research institution.
- Want additional reading for study, writing, a thesis, or personal research.
Conclusion
Unpaywall is a useful extension for frequent readers of research articles. It quickly locates free, lawful full-text versions and is particularly helpful for students, lecturers, researchers, and independent learners.
Although it cannot find every article, Unpaywall is a simple, safe, and appropriate tool for supporting scholarly literature searches.
If you regularly encounter paywalled articles, try installing Unpaywall in Chrome or Firefox to make scholarly reading more convenient. For difficult cases, contact Lê Minh Services for assistance. Best wishes with your research!