404 Page

Definition

HTTP 404 (Not Found) responses fall into two categories for SEO purposes: **Intentional 404s**: URLs that never existed and were never indexed — a typo in an inbound link, a URL probed by a bot, or a page that was removed and never had organic traffic. These are normal; Google handles them gracefully and eventually stops crawling them. **Unintentional 404s**: URLs that previously existed and were indexed by Google, have external backlinks or internal links pointing to them, and were removed or moved without 301 redirects. These break link equity, waste crawl budget, and create poor user experience for visitors following those links. Google Search Console\'s Pages report surfaces indexed pages returning 404 — these are the ones to address. **Custom 404 page requirements**: a useful 404 page returns the correct HTTP 404 status code (not 200 — this is a "soft 404," which Google may treat as duplicate content); provides navigation back to the homepage, relevant sections, or a search field; and is distinctive enough that users know they\'ve hit an error. Minimal 404 pages (just the status code, no page content) confuse users and don\'t provide recovery paths. **Soft 404**: a page that returns HTTP 200 but displays "page not found" content — common on CMSs where the 404 template renders with a 200 status. Google detects soft 404s and may treat them as thin duplicate pages rather than error responses. **Handling unintentional 404s**: 301 redirect the broken URL to the most relevant existing page (not always the homepage); or, if the content was genuinely removed with no replacement, allow the 404 (better than redirecting to irrelevant content). **Crawl budget impact**: in aggregate, a site with hundreds of internal links pointing to 404 pages wastes crawl budget on every crawl pass.

Why it matters for SEO

Broken links (resulting in 404s) on important internal pages waste crawl budget and break the internal link equity flow that PageRank-passing links provide. External links pointing to 404 URLs lose all link equity — the linking page\'s authority does not flow through to a page that returns 404. For sites after migration or redesign, undetected 404s from the old URL structure can cause significant ranking loss if important pages (with backlinks and indexing history) are not 301-redirected correctly.

How DeepSEOAnalysis checks this

During the site crawl, the audit follows all internal links and records the HTTP status codes returned. Pages returning 404 are flagged in the broken link findings. External links are sampled (rate-limited HEAD requests) to identify broken outbound links. The audit also checks for soft 404s — pages returning 200 with minimal content that may be treated as thin pages by Googlebot.

Useful tools and resources

• Free technical SEO audit
• Technical SEO audit checklist