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Preview of Unpaywall

Unpaywallby Impactstory team

Get free text of research papers as you browse, using Unpaywall's index of ten million legal, open-access articles.

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When you encounter a paywalled article, a colored tab gives you a link to a free PDF, if we can find one in our index of 10M+ open-access articles.
About this extension
When you view a paywalled scholarly article, Unpaywall automatically checks its open database of 16 million legal, open-access articles. If there's an open version somewhere, you'll see a green tab on the article. Click the tab and read for free, legally!

Unpaywall is a free, open-source project from Impactstory, a nonprofit dedicated to making scholarly research more open, accessible, and reusable.
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Add-on Links
Version
3.90
Size
675.4 KB
Last updated
a month ago (Sep 9, 2019)
License
MIT/X11 License
Privacy Policy
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Release notes for 3.90
* improved DOI detection
* stopped breaking XML pretty print in Firefox
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