What Is a 404 Page and How Should You Handle It?

If you’ve ever clicked a link and landed on a page that says “Page Not Found” or “404 Error”, you’ve encountered a 404 page. It’s one of the most common error states on the web, and virtually every website encounters them at some point. Understanding what causes 404 errors, how they affect your website, and how to handle them well can make a real difference to both user experience and SEO.

This guide explains what 404 pages are, how to find them on your own site, and what to do about them — including how to design a 404 page that turns a frustrating dead end into a useful signpost.

What Causes 404 Errors?

A 404 error occurs when a browser requests a URL that doesn’t exist on the server. The most common causes are: deleting a page without setting up a redirect; changing a URL or permalink structure without redirecting the old URLs; external sites or social media posts linking to a URL that no longer exists; and typing errors in links. Even a well-maintained website will accumulate some 404 errors over time, especially if it’s been running for several years and the URL structure has evolved.

It’s worth distinguishing between “soft” 404s and real ones. A soft 404 is when a page returns a 200 OK status code but displays “Page not found” content. This confuses Google and should be avoided. A proper 404 returns a 404 HTTP status code, which tells crawlers the page genuinely doesn’t exist.

How 404 Errors Affect SEO

A 404 page on its own is not a ranking penalty. Google understands that pages get deleted and URLs change — it’s a normal part of how the web works. However, if valuable pages are returning 404 errors rather than being properly redirected, you’re losing the link equity those pages had accumulated. Any backlinks pointing to a 404 URL are wasted.

The fix is to set up 301 redirects from deleted or changed URLs to the most relevant current page. A 301 redirect tells Google (and browsers) that the page has permanently moved, passing the ranking value to the new URL. For sites that have gone through a redesign or URL restructure, cleaning up 404 errors and installing proper redirects can produce a noticeable improvement in organic traffic.

How to Design a Helpful 404 Page

Since some 404 errors are unavoidable, your custom 404 page should be a genuine help to the visitor rather than a bare error message. At minimum it should acknowledge the error clearly, offer a link back to your homepage, and ideally include navigation or a search bar so the visitor can find what they were looking for. A friendly, on-brand message goes a long way — many companies use their 404 page as a small opportunity for personality.

Avoid blank 404 pages or unhelpful generic server messages. These tend to result in visitors immediately leaving your site (a high bounce rate on a 404 page is understandable, but a good custom page can recover a proportion of those visitors). You can use Google Search Console to find which URLs on your site are returning 404 errors, then decide whether to restore the page, redirect to a relevant alternative, or leave the 404 in place if the page was never intended to exist.