404 page checker

What is a 404 Page Checker?

The 404 Page Checker verifies that a website correctly returns an HTTP 404 status code for pages that do not exist, rather than silently serving a 200 OK response for missing content (a "soft 404").

Why Correct 404 Handling Matters

• Crawl budget — Search engines that see soft 404s may keep re-crawling non-existent URLs, wasting crawl budget that could go to real pages.
• Duplicate content risk — A generic "not found" message returned with a 200 status can be indexed as thin/duplicate content across every broken URL.
• User trust — A properly styled 404 page with a real 404 status code signals a well-maintained site to both users and crawlers.