Link Rot
Link rot is the gradual process by which hyperlinks stop working over time as the pages they point to move, get deleted, or go offline. Each dead link is a symptom. Link rot is the ongoing decay across the web that produces them. It is also called link death or reference rot.
Every link you place today has a limited lifespan. As sites restructure, domains expire, and content is removed, once-working links quietly break.
Why Link Rot Matters
Link rot erodes the reliability of the web. Readers who follow a source and hit a 404 lose trust in the content and its author. Research, journalism, and legal citations suffer most, because a claim backed by a dead link can no longer be verified.
For SEO, link rot means accumulating broken links across your site. These waste crawl budget, harm user experience, and let ranking signals from lost backlinks leak away. On large sites the decay compounds year over year if no one audits for it.
Link rot also affects internal knowledge. Documentation, wikis, and help centers full of dead references become harder to use and maintain.
Link Rot Examples
The scale of link rot is well documented:
- A 2024 Pew Research Center study found that 38% of webpages that existed in 2013 were no longer accessible a decade later.
- The same study found 23% of news webpages and 21% of government webpages contained at least one broken link.
- Harvard Law School research on Perma.cc found roughly 50% of URLs cited in U. S. Supreme Court opinions no longer pointed to the intended content.
- A study of New York Times articles found 25% of deep links were completely inaccessible.
These numbers show link rot is not an edge case. It is the default outcome for any link left unmaintained.
What Causes Link Rot
Link rot has several recurring causes:
- Content deletion. A page is removed and no redirect replaces it.
- Domain expiry. The destination site shuts down or the domain lapses.
- Site restructuring. A redesign or CMS migration changes URL slugs and folders.
- Paywalls and access changes. Content that was public moves behind a login.
- Content drift. The URL still loads, but the content has changed so the link no longer supports its original point.
Content drift is a quieter cousin of link rot. The link is not broken, so audits miss it, yet it no longer says what it once did.
How to Prevent Link Rot
You cannot stop the web from changing, but you can limit the damage:
- Audit links regularly. Crawl your site with a tool such as Screaming Frog or Ahrefs to catch dead links before readers do. To check a single URL, run it through a URL validator.
- Use 301 redirects. When you move or delete a page, redirect the old URL so existing links keep working.
- Keep stable permalinks. Set a permanent URL structure and avoid changing slugs after publishing.
- Archive important sources. Save cited pages to the Wayback Machine or Perma.cc and link to the archived copy.
- Prefer durable identifiers. For academic sources, cite a DOI instead of a raw URL.
Frequently Asked Questions
What is link rot?
Link rot is the process by which hyperlinks stop working over time because the pages they point to are moved, deleted, or taken offline. The result is a growing number of broken links. It is also known as link death or reference rot.
What is an example of link rot?
A 2024 Pew Research Center study found that 38% of webpages from 2013 were no longer accessible by 2023. Another common example is a news article citing a source URL that now returns a 404 because the original page was removed.
What is the difference between link rot and a broken link?
A broken link is a single hyperlink that no longer works. Link rot is the wider phenomenon of links decaying across the web over time, which produces those broken links. Broken links are the symptom, link rot is the process.
How do you prevent link rot?
Audit your links regularly, add 301 redirects when pages move, keep permalinks stable, and archive important sources to the Wayback Machine. Using durable identifiers like DOIs for academic citations also helps.
Catch decaying links early by checking your URLs with the free URL validator at linkutm.