What is Unpaywall?

Unpaywall is a Chrome extension developed by https://unpaywall.org, and its main feature is "Legally get full text of scholarly articles as you browse.".

Extension Screenshots

Download Unpaywall Extension CRX File

Download Unpaywall extension files in crx format, manually install Chrome extensions in the browser, or share the crx files with friends to easily install Chrome extensions.

Extension Usage Instructions

Get full text of scholarly articles as you browse. When you view a research article, Unpaywall automatically looks for a copy in our index of 20 million free, legal fulltext PDFs. If we find one, click the green tab to read the article.

Unpaywall points you to legal, author-posted manuscripts that are hosted on university and government web servers. We are pointing to versions that have been posted with the full and explicit authorization of the publishers themselves.

These free, author-posted manuscripts are often called "Green Open Access" and are a longstanding and completely legal part of the scholarly communications ecosystem. The majority of scholarly journals permit authors to "self-archive" their papers on university and government web servers. It's these legally self-archived papers that Unpaywall helps users find. Any papers posted outside of publisher permissions are NOT included in our index.

Extension Basic Information

Name	Unpaywall
ID	iplffkdpngmdjhlpjmppncnlhomiipha
Official URL	https://chromewebstore.google.com/detail/unpaywall/iplffkdpngmdjhlpjmppncnlhomiipha
Description	Legally get full text of scholarly articles as you browse.
File Size	667 KB
Installation Count	773,806
Current Version	3.98
Last Updated	2021-07-30
Publish Date	2020-02-28
Rating	4.05/5 Total 222 Ratings
Developer	https://unpaywall.org
Payment Type	free
Extension Website	https://unpaywall.org/products/extension
Help Page URL	https://unpaywall.org/faq
Supported Languages	en
manifest.json
{ "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx", "name": "Unpaywall", "version": "3.98", "manifest_version": 2, "description": "Legally get full text of scholarly articles as you browse.", "icons": { "16": "img\/icon-16.png", "32": "img\/icon-32.png", "48": "img\/icon-48.png", "64": "img\/icon-64.png", "128": "img\/icon-128.png" }, "applications": { "gecko": { "strict_min_version": "53.0" } }, "browser_action": { "default_icon": "img\/icon.png", "default_title": "Unpaywall", "default_popup": "popup.html" }, "background": { "scripts": [ "background.js" ], "persistent": true }, "content_security_policy": "script-src 'self'; object-src 'self'", "content_scripts": [ { "matches": [ "" ], "js": [ "js\/jquery-3.1.1.min.js", "unpaywall.js" ] } ], "permissions": [ ":\/\/.oadoi.org\/*", "storage" ], "web_accessible_resources": [ "unpaywall.html" ], "options_ui": { "page": "options.html", "chrome_style": true } }