404 Error Page Test
Short answer
Verify your site returns proper 404 responses for missing pages.
What It Does
Tests how your site handles unknown URLs by requesting a path that does not exist. Checks that the response has a 404 status rather than 200 (a "soft 404", which Google Search Console reports as an indexing problem) and whether the page helps visitors, with your branding, navigation, a search box and a link back home.
Why It Matters
Soft 404s — pages that say "not found" but return HTTP 200 — are reported in Google Search Console and can waste crawl budget on dead URLs. A helpful 404 page with navigation also gives lost visitors a way back into the site.
How It Works
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Enter your domain and click Test
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We request a non-existent URL and capture the response
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Verify HTTP status is 404, not 200 ("soft 404")
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Check the page for navigation, a search box, a link back home, and your site's branding
Sample input + output
url: https://rankproof.eu/this-page-does-not-exist
HTTP status: 404 OK custom 404 page: yes OK search box: present OK navigation: present OK return-to-home link: yes OK branded header: yes OK usability score: 100/100 OK
Who Uses This
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Technical SEO
Validate the 404 template after every CMS or framework upgrade — catch the day a custom error handler returns 200 by mistake.
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UX Designer
Confirm the 404 page has a search box, navigation and a link back home, so lost visitors can find their way.
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DevOps Engineer
Run this after every deploy — confirm a non-existent URL still returns 404, not 200.
Frequently Asked Questions
What's the difference between hard 404 and soft 404?
A hard 404 returns the HTTP 404 status. A soft 404 returns HTTP 200 with "not found" content. Google Search Console reports soft 404s as an indexing issue, and crawling them wastes crawl budget that could go to real pages.
Should I redirect 404s to the homepage?
No. Google may treat such redirects as soft 404s. Return a real 404 with helpful navigation, or redirect with 301 to a closely related page if the content moved.
Should the 404 page be `noindex`?
It does not need to be. Google does not index pages that return a 404 status, so a real 404 status is enough.
What should be on a good 404 page?
Clear "page not found" message, search box, top-category links, popular content recommendations, contact/support link, branded design.
How can I see all my 404s?
The Page indexing report in Google Search Console lists the not-found URLs Google has crawled.