What Is a 404 Error?
A 404 error means a requested page can't be found. Not a penalty by itself, but a costly loss when backlinks point to it, with a real example.
A 404 error is the status code a server returns when a requested page cannot be found. It means the URL doesn’t correspond to any live page on the site, distinct from a server error or a redirect.
Why 404 errors matter
A 404 itself isn’t inherently bad since it’s an accurate, honest signal that a page is genuinely gone, Google has repeatedly confirmed that 404s on intentionally removed content aren’t penalized. The real cost shows up specifically with unaddressed 404s that have existing backlinks or search traffic pointing to them, that’s wasted accumulated authority and lost visitors a redirect could have preserved instead. The distinction matters: a 404 on a page nobody ever linked to or visited is a non-issue; a 404 on a page with dozens of backlinks and steady organic traffic is a real, quantifiable loss.
How 404 errors happen
- A page is deleted without a redirect put in place to forward visitors elsewhere.
- A URL is mistyped in a link, either internal or external, pointing to a page that never existed at that address.
- Content is moved to a new URL during a redesign or migration without the old URL being redirected.
- An external site links to a URL that has since changed or been removed on your end, outside your direct control to fix at the source.
How to handle 404 errors
- Set up a 301 redirect for any 404 that has existing backlinks or organic search traffic, preserving the accumulated value.
- Leave genuine, low-value 404s alone. Not every deleted page needs a redirect, some content should simply be retired.
- Build a helpful custom 404 page with navigation and search, reducing bounce for visitors who do land there by mistake.
- Monitor 404s regularly via Google Search Console’s Pages report, which flags “Not found” errors Google has encountered.
- Fix internal links pointing to 404s directly rather than relying on a redirect to patch over a broken internal link.
404 vs. soft 404 vs. 410
| Status | What it means |
|---|---|
| 404 | Page not found, standard “not here” signal |
| Soft 404 | Page returns a 200 (success) status but shows “not found” content, a misconfiguration Google specifically flags |
| 410 | Page is gone permanently and intentionally, a slightly stronger signal than a standard 404 |
Real example
For example, if a blog post is deleted without a redirect and someone clicks an old link to it from a search result or another site, they’ll land on a “404 Page Not Found” message instead of content, and if that post had accumulated backlinks or steady organic traffic, all of that value is now going nowhere instead of being redirected somewhere useful.
404 errors and AI search
A 404 on a URL an AI system has previously indexed or cited creates a broken link in a generated answer, arguably a worse user experience than a traditional search result 404, since the visitor arrived with higher trust based on the AI’s specific citation. Monitoring and redirecting 404s on previously well-performing pages matters just as much for protecting AI-referred traffic as it does for traditional organic clicks.
FAQ
Do 404 errors hurt my site’s rankings overall?
Not directly or site-wide. Google has confirmed 404s on intentionally removed pages don’t cause a penalty; the loss only applies to the specific traffic and link value that page had accumulated.
Should every 404 be redirected?
No. Redirect the ones with existing backlinks or traffic; genuinely low-value, unlinked pages can simply remain 404 without meaningful cost.
What’s a soft 404 and why is it a problem?
A soft 404 returns a success status code while showing “page not found” content, confusing search engines about whether the page actually exists, Search Console specifically flags these as an issue to fix.
How do I find 404 errors on my site?
Google Search Console’s Pages report under Indexing lists “Not found (404)” as an exclusion reason, and a crawler tool like Screaming Frog can find them directly by crawling the site.
Related terms
A 404 isn’t the problem, an unaddressed 404 with backlinks pointing to it is. Check which ones actually matter before deciding whether to fix them.