Link Rot

Link rot is the gradual process by which hyperlinks on the web become broken over time as the pages they point to are moved, deleted, or allowed to expire.

What is link rot?

Link rot is the gradual breakdown of hyperlinks over time. Links that worked when they were created stop working as destination pages get moved, deleted, or restructured. The term compares digital links to organic material. Without maintenance, they decay naturally as the web changes around them.^[1]

Link rot is not a one-time event. It is an ongoing process. A page that links to ten external sources today may have three or four broken links within a few years.

How widespread is link rot?

The scale of link rot is well documented:

A 2021 study by the Pew Research Center found that about 25% of all web pages that existed between 2013 and 2023 were no longer accessible by 2023.^[1]
A Harvard Law Review study found that over 70% of URLs in U.S. Supreme Court opinions and 50% of URLs in legal journals were broken.^[2]
The Internet Archive estimates that the average web page lasts roughly 100 days before it is changed or removed.

For any organization that publishes content with citations, these numbers are a warning. The links you add today will start breaking within months.

What causes link rot?

CMS migrations and redesigns. When organizations rebuild their websites, URL structures often change. This breaks every internal and external link pointing to the old URLs. A bank that migrates from one platform to another without setting up redirects can break thousands of links overnight.

Content removal. Pages get deleted when campaigns end, products are discontinued, or content becomes outdated.

Domain changes. Organizations that rebrand and switch domains frequently stop maintaining redirects after a few years. Once the redirects disappear, all incoming links break.

Host shutdowns. Free hosting platforms, university web spaces, and personal blogs get shut down. Every link pointing to those sites dies instantly.

Paywalls. Content that was once free may move behind a paywall. The link still works, but visitors without a subscription cannot access the content.

Who does link rot affect?

Content teams face the biggest day-to-day impact. Citations and resource links in published articles gradually become useless. A healthcare portal that links to external medical guidelines needs those links to work. Broken citations undermine trust and credibility.

IT teams deal with internal link rot when site structure changes. Broken links waste search engine crawl budget and hurt site performance. Crawlers encounter 404 errors where they expected content.

Legal and compliance teams face risk when regulatory citations break. A government website that references specific legislation needs those links to stay valid. Broken legal citations can raise questions about whether requirements are still being met.

How do you prevent link rot?

Set up 301 redirects whenever you change URL structures. Avoid creating redirect chains by pointing old URLs directly to the final destination. Maintain them as long as old URLs may be linked from external sites.

Use stable URL patterns that do not change when metadata like dates or categories change. Avoid putting dates or category names in URLs if they might change.

Archive important sources using the Internet Archive's Wayback Machine. Link to archived versions for critical citations.

Run regular link audits as part of your content audit cycle. Catch and fix broken links before they pile up. For sites with 10,000+ pages, monthly or quarterly scans are reasonable.

Use persistent identifiers like DOIs in academic and publishing contexts. DOIs are managed by a registry and redirect to current locations even when publishers change their URLs.^[3]

How Askem Helps

Continuous link monitoring tools check links on a schedule, not just on demand. When a working link breaks, the tool sends an alert so content teams can fix it before users encounter it. Tools like Askem scan websites, portals, and PDFs — covering the full range of content where link rot typically builds up. For regulated sites where broken citations or legal references create compliance risk, real-time alerts reduce exposure without requiring manual link audits every week.

Sources

Pew Research Center — When Online Content Disappears: https://www.pewresearch.org/data-labs/2024/05/17/when-online-content-disappears/
Zittrain, J., Albert, K., & Lessig, L. — Perma: Scoping and Addressing the Problem of Link and Reference Rot in Legal Citations: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2329161
DOI Foundation — What is a DOI?: https://www.doi.org/the-identifier/what-is-a-doi/