Link Decay
Link decay is the gradual loss of backlinks, or of their value, as linking pages are deleted, edited, archived or lose traffic. Steady new link building offsets it.
Causes of Decay
Every backlink profile loses links over time, even when the site owner does nothing wrong. The web changes constantly, and links disappear with it.
Pages get deleted. Publishers prune old content, retire outdated guides and remove posts that no longer get traffic. When a page goes, every link on it goes too.
Sites shut down. Businesses close, blogs are abandoned and domains expire. Large studies of link rot show that a significant share of web pages from a decade ago no longer load at all.
Content gets edited. Writers update articles and swap old sources for new ones. A link to your 2021 study may be replaced with a link to a competitor’s 2025 study during a routine refresh.
Sites are redesigned or migrated. URL changes, new templates and platform moves often drop links, especially in sidebars, footers and resource lists. Redirect mistakes on the linking site can also break links to you.
Paid placements end. Links bought on a rental basis, or placed by vendors who later remove them, disappear when payments stop or the vendor cleans up. Link vendors also go out of business, and the sites they used for placements often vanish with them.
Your own site causes some decay too. Deleting or moving pages without redirects turns working backlinks into broken ones.
There is also a quieter form: value decay. The link stays live, but the page holding it loses strength. It slips into archives, loses its own backlinks, stops getting traffic or gets buried deeper in the site’s structure. The link passes less over time, even though nothing visible has changed.
SEO Impact
Link decay matters because rankings depend partly on the links a page holds today, not the links it once had.
When removed links and lost backlinks pile up, a page’s link strength drops. Rankings can slip gradually, even when nothing on your own site has changed. Many unexplained ranking declines trace back to slow, unnoticed link loss, especially for pages that have not earned new links in a long time. A careful look at why rankings drop should always include a check of lost links.
The effect is uneven. Losing a link from a strong, relevant site can hurt more than losing dozens of weak ones. That is why a regular look at lost referring domains belongs in routine reporting, right next to new links. A few high-quality editorial links often carry a page, so losing even one of them is noticeable.
Decay also affects competitors, which is why relative movement matters. If your competitors keep earning links while your profile slowly shrinks, the gap widens even if your own losses are small.
Link decay interacts with link age. Older links on maintained, popular pages tend to last and hold their value. Older links on neglected pages are more likely to vanish or weaken. A profile full of old links is not automatically safe if those links sit on pages nobody updates.
The good news is that some decay is recoverable. A share of lost links can be restored, redirected or replaced, as long as you notice them in time.
Monitoring Link Decay
Monitoring decay starts with knowing what you have. Keep a record of your most important backlinks, especially strong editorial links, guest posts and placements that drive referral traffic.
Use a backlink tool to track lost links. Ahrefs, Semrush and Majestic all report links that have disappeared, often with a reason such as “link removed,” “page not found” or “redirected.” A backlink monitoring tool can alert you when an important link changes, so you can act quickly.
Check Google Search Console as well. Its Links report shows top linking sites and pages. Comparing exports over time reveals sites that have stopped linking. The process for how to check backlinks in Google Search Console explains where to find that data.
Watch for broken pages on your own site. Crawl your site regularly and look for URLs that return 404 errors while still receiving external links. These are self-inflicted losses that are easy to fix.
Track the trend, not just individual links. Plot total referring domains and new versus lost domains each month. A steady net gain is healthy. Flat or falling numbers mean decay is outpacing new links.
Review high-value pages separately. Your money pages and key guides deserve closer attention than the site as a whole.
Offsetting Decay
The first line of defense is link reclamation. When a link disappears, find out why. If the page moved, ask the site owner to update the link. If the content was edited, offer an updated resource that fits. If your own page broke, add a redirect or restore it.
Turn unlinked mentions into links. Monitoring brand mentions helps you spot new references to your brand that lack a link, which can replace links lost elsewhere.
Keep your own URLs stable. Plan site migrations carefully, map redirects for every page with backlinks and avoid deleting pages that still attract links.
Refresh the content that earns links. Linkable assets with outdated statistics or broken tools lose their place in other writers’ articles. Regular updates keep them worth citing.
Build links continuously. Decay never stops, so a profile that stops growing slowly shrinks. A steady pace of new links keeps net growth positive and looks natural, which is the idea behind healthy link velocity.
Favor durable links. Editorial links from real publishers tend to last for years. Paid placements on low-quality sites often disappear when payments stop or sites are sold. The method you use to build links shapes how quickly your profile decays.
Link decay is a constant background process, not a sign that something is wrong. Monitor your important links, reclaim what you can, keep your own URLs stable and keep earning new links so your profile grows faster than it shrinks.