Link rot: the quiet decay eating the web's citations
Click through the references of an article from ten years ago and you'll hit them quickly: 404s, parked domains, redirects to homepages that no longer mention the cited material. Researchers who audit old link collections — court opinions, academic papers, news archives — consistently find that a large fraction of links more than a few years old no longer resolve to their original content.
How links die
- Site restructures. A CMS migration changes every URL on a site, and nobody maps the old paths to the new ones.
- Domains lapse. The company folds or the renewal email goes to a dead inbox; the domain gets parked or resold.
- Content is withdrawn. Pages get unpublished — legal reasons, rebrands, embarrassment.
- Platforms shut down. Entire services disappear and take every URL they ever minted with them.
What it costs
Each dead link is small; the aggregate is not. Citations stop being checkable. Tutorials point at voids. Printed materials — packaging, books, signage — carry URLs that stopped working years before the ink faded. Trust erodes in a thousand tiny increments, because the reader never knows in advance which links still hold.
Slowing the rot
- Redirect through migrations. If you restructure a site, map old URLs to new ones and keep the redirects alive indefinitely. Redirects are cheap; lost readers aren't.
- Archive what you cite. Public web archives exist precisely so a citation can outlive its source. Save a snapshot when you link to something you care about.
- Use managed links for anything printed or permanent. This is the one place a shortener genuinely extends a link's life: a short link with an editable destination can be re-pointed when the original URL moves, so the printed code keeps working. (It does shift the trust to the shortener — which is why we treat durability as a core promise, not a feature.)
- Audit periodically. A quarterly crawl of your own outbound links catches rot while the replacement content is still findable.
The web forgets by default. Keeping links alive is a maintenance habit, not a one-time setup — but it's one of the cheapest forms of respect you can show your readers.