When visiting a page that no longer exists, users typically encounter a 404 error. If not handled properly, a 404 error can hurt both user experience and SEO. This article explains 404 errors and the 301 redirect, along with how to handle them correctly.
What Is a 404 Error?
A 404 error (404 Not Found) appears when a user or search engine tries to access a URL that doesn’t exist on a website, usually because the page was deleted, the URL changed without updating links, or the user typed the address incorrectly.
What Is a 301 Redirect?
A 301 redirect is a permanent redirect method from an old URL to a new one, telling both browsers and search engines that the content has moved permanently to a new address, and passing nearly all of the SEO value from the old URL to the new one.
Why Do You Need to Understand 404 Errors and 301 Redirects?
Impact on User Experience
Users who land on a 404 page tend to leave the website immediately, raising the bounce rate and reducing conversion opportunities.
Wasting Accumulated SEO Value
If a page with strong backlinks and rankings is deleted without a redirect, all of that page’s SEO value is lost entirely instead of being carried forward.
Impact on Crawl Budget
Too many 404 errors on a website can waste Google’s crawl budget on pages with no remaining value, affecting how efficiently other important pages get crawled.
When Should You Use a 301 Redirect?
When Changing Your Website’s URL Structure
When changing the URL structure during a website redesign, you need a 301 redirect from every old URL to its corresponding new URL to avoid losing existing traffic and rankings.
When Merging or Deleting Content Pages
If you merge several articles into one or delete a page entirely, use a 301 redirect to the closest relevant page instead of leaving visitors to hit a 404 error.
When Changing Domain Names
When a business switches domain names, it needs a 301 redirect from the entire old domain to the new one to preserve the rankings and traffic already built up.
How to Check for 404 Errors on Your Website
You can use Google Search Console (the Coverage/Pages section) to find URLs currently returning 404 errors, then plan redirects or content restoration accordingly.
Should You Create a Custom 404 Page?
Yes. A custom 404 page with a friendly design and navigation suggestions back to the homepage or related categories helps retain users instead of losing them the moment they hit a dead end.
Understanding 404 errors and the 301 redirect is the first step toward applying this knowledge in practice rather than only grasping it in theory. A deep understanding of the 301 redirect is the foundation for implementing a technical strategy that stays effective and sustainable over time. This is also why the 301 redirect remains a constant topic in authoritative SEO resources today.
Conclusion
Properly handling 404 errors and using a 301 redirect wisely helps a website preserve its built-up SEO value and significantly improves user experience. If your website has unresolved 404 errors, contact our technical team for a full audit and fix.
You can also check out our articles on what a canonical tag is and what a backlink is, as well as reference material from Google Search Central to better understand this before getting started.