HTTP Status Code Reference & Tester
Look up and test HTTP status codes and headers.
OK
SEO Impact: Standard success response. Search engines index and render normally.
Moved Permanently
SEO Impact: Permanent 301 redirect passes ~99% SEO link equity to new URL.
Found (Temporary Redirect)
SEO Impact: Temporary redirect. Original URL retains ranking signals in index.
Not Modified
SEO Impact: Informs search crawlers the cached version has not changed.
Bad Request
SEO Impact: Invalid syntax. Prevents bot indexing.
Unauthorized
SEO Impact: Authentication required. Crawlers will not index protected page.
Forbidden
SEO Impact: Server refusal. Crawlers will drop URL from search index.
Not Found
SEO Impact: Page does not exist. Drops URL from index after repeated crawls.
Gone
SEO Impact: Explicitly permanently removed. Google drops index faster than 404.
Internal Server Error
SEO Impact: Server crash. Frequent 500 errors lead to lower search ranking.
Service Unavailable
SEO Impact: Temporary maintenance. Tells bots to retry later without deindexing.
Operating Manual
3-STEP WORKFLOWSearch or filter by status code (e.g. 200, 301, 302, 404, 410, 500, 503).
Read the clear explanation, technical definition, and SEO impact for each code.
Copy status descriptions directly into developer notes.
About This Tool
INFORMATIONFast reference directory of all 1xx, 2xx, 3xx, 4xx, and 5xx HTTP status codes with SEO implications and quick lookup.
This tool processes your input locally in your web browser. Your files, texts, and data never leave your device, ensuring total privacy and instant results with zero wait times.
Frequently Asked Questions
What is the SEO difference between 301 and 302 redirects?
A 301 is a permanent redirect that passes SEO ranking equity (link juice), while a 302 is temporary and does not transfer canonical equity.