Error 404
A 404 error is an HTTP status code indicating the server cannot find the requested page or resource. It is one of the most common web errors, signaling that the URL a user navigated to does not correspond to any existing content on the server. While sometimes unavoidable, excessive or unmanaged 404s harm user experience, SEO performance, and conversion rates.
Common Causes
The most frequent cause is a deleted or moved page where the old URL was not redirected to the new location. Typos in manually entered URLs, broken internal or external hyperlinks, and incorrect URL structures after a site redesign also trigger 404s. Renamed products, expired campaign landing pages, and restructured URL hierarchies are common culprits for e-commerce and SaaS websites. Search engine crawlers may also encounter 404s when indexed pages are removed without proper handling.
Impact on SEO and User Experience
Search engines treat occasional 404 errors as normal, but a large number signal poor site maintenance and reduce crawl efficiency. When Googlebot encounters many 404s, it may lower crawl frequency for your site, slowing the indexing of new content. For users, hitting a 404 page creates friction that often results in abandonment – most users who encounter a 404 leave the site rather than search for the content elsewhere. Using website monitoring software helps detect and address 404 errors before they accumulate.
How to Handle 404 Errors
Prevention is the best approach. Implement 301 redirects whenever you move or rename a page. Regularly audit your site for broken links using SEO software and crawling tools. When 404 errors are unavoidable, design a custom 404 page that guides users back to useful content, includes a search bar, and links to popular pages or categories. Avoid serving a generic browser error or redirecting all 404s to the homepage, which confuses both users and search engines.
Monitoring and Fixing 404s
Use Google Search Console’s coverage report to identify pages returning 404 errors that Google has attempted to crawl. Server log analysis reveals 404s triggered by real user visits. Prioritize fixing 404s on pages that receive traffic, have inbound backlinks, or previously ranked in search results, as these represent the greatest loss of value.
