Websites change. Perma Links don’t. helps scholars, journals, courts, and others create permanent records of the web sources they cite.
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How can my library get involved? is a simple way to preserve your links.
One good reason to use How about 404?
Websites change, go away, and get taken down. When linked citations lead to broken, blank, altered, or even malicious pages, that’s called link rot.
Link rot affects everyone who cites links
Over 50% of cited links in Supreme Court opinions no longer point to the intended page. Roughly 70% of cited links in academic legal journals and 20% of all science, technology and medicine articles suffer from link rot.
Articles and studies
Perma: Scoping and Addressing the Problem of Link and Reference Rot in Legal CitationsThe Harvard Law Review, 2014
The CobwebThe New Yorker, 2015
Scholarly Context Not Found: One in Five Articles Suffers from Reference RotPLOS One, 2014
Link rot destroys the integrity of your citations
Links start healthy. New citations have been vetted and verified.
After one year. After a year, over 20% of cited links may be dead or otherwise inaccessible.
After five years. After five years, the situation is much worse — over 50% of cited links can be affected.
As time goes on. Link rot is inevitable and rarely reversible. The longer the wait, the more likely a link will have rotted.
Sign up and start preventing link rot
Data taken from “Perma: Scoping and Addressing the Problem of Link and Reference Rot in Legal Citations,” Jonathan Zittrain, Kendra Albert & Lawrence Lessig. Harvard Law Review. March 17, 2014.
Meet the Perma Link.
A Perma Link is a reliable, unbreakable link to an unalterable record of any page you’ve cited. It’s a time capsule for a web page, which your readers can easily access.
We’re committed to preservation
Websites change, go away, and get taken down. When they do, linked citations can lead to broken, blank, unintentional, or even malicious pages. This decay is called “link rot.” helps scholars, journals and courts prevent link rot by creating permanent, reliable, unalterable links to the online sources cited in their work.
All about Perma Links
Frequently asked questions
Once you capture a Perma Link, neither its content nor its address will change, no matter what happens to the original link.
Who runs
How long do Perma links last?
Can I delete a Perma link?
Is open source?
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More questions? Get more answers.
It’s easy to make and use a Perma Link.
Copy. Paste. Perma.
Step 1
Find the page you want to preserve.
Copy its URL and open
Step 2
Add your URL to
Select Create Perma Link and does the rest.
Step 3
Get your Perma Link. builds your new record in a matter of moments. When it’s finished, you have a chance to delete or annotate it.
Step 4
Use the Perma Link in your citations.
Use your Perma Link as you would the original cited URL. Your citation is safe from link rot — it will never change or break.
Built to last.
Libraries are in the forever business. We’re committed to preserving your digital records to the same standards that we preserve physical records. That’s why over 150 journals, courts, and universities trust us with their citations.
Articles and awards
Webby award winner: Best Law Website 2015
Cooking up a solution to link rotLaw Library of Congress Blog, 2015
The Problem with URLs in Legal Marketing BloombergBNA Big Law Business, 2015
Can the Internet Be Archived?The New Yorker, 2015
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Over 150 academic law journals use for journals

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