Soft 404 Checker

The Soft 404 Checker is a free tool that tests how a site handles pages that don't exist. It requests a guaranteed-nonexistent URL on the domain you enter and inspects the real HTTP status code that comes back — the exact signal search engines use to decide whether a page is genuinely missing or should be crawled and indexed like any other.

Soft 404s are a quiet, common technical SEO mistake: a broken link that redirects to the homepage instead of returning a 404, or a CMS that serves a "not found" page dressed up with a 200 OK status underneath. Visually it can look fine — the trouble only shows up in the HTTP response itself, which is exactly what this checker inspects directly.

When you submit a domain, the tool generates a random, unique path guaranteed not to exist on that site and requests it directly, following any redirects by hand so it can count how many hops occur and where the request finally lands.

If the final response is a 200 OK, it's flagged as a soft 404 — regardless of whether that happened immediately or after redirecting to another page like the homepage. If the final response is a real 404 or 410, the tool also inspects that page's HTML for a title and enough content to judge whether it's a custom-designed 404 page or a bare, default server error page.

• A 200 OK for a page that doesn't exist is the single clearest soft-404 signal — fix the server or CMS configuration so nonexistent URLs return a real 404 or 410 status instead.
• Redirecting every dead URL to the homepage feels user-friendly, but if that redirect lands on a 200 OK page, search engines still see it as a soft 404 — the homepage doesn't legitimately represent the missing page.
• A bare, unstyled error page still counts as a correct 404 technically, but a designed one with navigation and a clear message keeps visitors from bouncing off the site entirely.
• Re-run this check after any server, CMS, or hosting migration — 404 handling is exactly the kind of configuration that quietly breaks during a platform change.