What Is a 404 Error and When You Should (and Shouldn't) Worry About It

What a 404 actually is

A 404 is the standard HTTP status code a server returns when a requested page genuinely doesn't exist at that specific URL. It's a completely normal, expected, built-in part of how the web fundamentally works — not inherently an error in the sense of something being broken or malfunctioning. Content gets removed, URLs change, people mistype addresses — 404s are a routine, expected part of a functioning site's life, not automatically a sign that something has gone wrong.

Why 404s genuinely don't deserve automatic, blanket panic

A reasonable, expected number of 404s exists on essentially every real, actively maintained site — old campaign pages that were always meant to be temporary, outdated content deliberately removed once it was no longer relevant, or simple typos in a URL someone happened to type manually. Google has stated directly and repeatedly that 404s themselves are not inherently harmful to a site's rankings — they're an expected, completely normal part of how the web naturally works over time as content comes and goes.

When a 404 genuinely is worth real, direct concern

When it's a page that used to rank and have real, established traffic or backlinks pointing to it. Losing a page like that without setting up a proper redirect to its closest current, relevant equivalent means losing real accumulated ranking signal, real established traffic, and real inbound link value permanently, rather than genuinely preserving and transferring any of it forward.

When internal links on the site still actively point to it. A broken internal link creates a genuinely poor, jarring experience for a real visitor clicking through, and wastes crawl budget on a dead end instead of a working page — this is worth fixing directly regardless of whether the underlying page itself should have been removed in the first place.

When it's happening in unexpectedly large volume across the site, or specifically on a page that should clearly still exist and work normally. A single, expected 404 is routine. Dozens or hundreds appearing unexpectedly is a real, concrete signal something structural has actually gone wrong — a broken migration, a misconfigured redirect rule, or some other systemic technical issue worth investigating directly.

When a genuinely valuable, currently-relevant page returns a 404 unintentionally. This is different from deliberately, intentionally retiring old content — it's an accidental, unplanned loss of something that was never actually meant to go away.

When a 404 is genuinely, completely fine and not worth worrying about at all

A page that's deliberately, intentionally removed because it's genuinely outdated or no longer relevant, with no meaningful remaining traffic or backlinks pointing to it, returning a clean, proper 404 is exactly correct, expected behavior — not a problem to fix. Someone simply mistyping a URL and landing on a 404 is normal, everyday web behavior, not a site defect of any kind. A small handful of naturally occurring 404s scattered across an actively evolving, actively maintained site is genuinely nothing to be concerned about on its own.

What actually matters more than the raw 404 count itself

Whether the 404 is intentional or accidental. Whether the missing page had genuine, real value — established traffic, real backlinks, meaningful historical ranking — worth actually preserving through a redirect. And whether other pages on the site are still actively linking to it, creating a real, ongoing broken experience for visitors clicking through, rather than the URL simply sitting quietly unreachable and effectively forgotten by everything else on the site.

How to actually check for 404s that genuinely matter

A real site crawl reports every 404 encountered, along with which internal pages, if any, are still actively linking to it. Google Search Console's Page Indexing report separately shows pages Google itself has previously crawled that are now returning 404s — genuinely useful specifically for spotting valuable pages that disappeared unintentionally, rather than pages that were always meant to be removed on purpose.

A good, custom 404 page is still genuinely worth having regardless

Even for entirely expected, routine 404s, a well-designed custom 404 page — clear navigation back to working parts of the site, perhaps a working search box — meaningfully improves what would otherwise be a dead-end experience for a real visitor. This doesn't fix or prevent the underlying 404 itself, but it does make hitting one meaningfully less frustrating when it inevitably happens.

The realistic takeaway

404s are a normal, expected, and genuinely unavoidable part of how the web actually works — not something to eliminate entirely as a goal in itself. What actually matters is distinguishing the routine, harmless ones from the small subset that genuinely represent lost value or an active, ongoing broken experience for visitors, and directing real, focused attention specifically at that smaller, more consequential subset.