How to use SEO Site Checker
- Paste or load response headers, cURL -i output or a HAR into SEO Site Checker.
- Hit Analyze and SEO Site Checker computes the result client-side.
- Review the parsed redirect chain and security-header audit shown below.
About this tool
SEO Site Checker is a static, client-side tool with no backend. SEO Site Checker reconstructs a redirect chain and status codes from response headers, a curl -i dump or a HAR you capture in DevTools.
Because browsers block cross-origin live requests, SEO Site Checker works from captured headers rather than fetching the URL itself. Nothing you enter is uploaded, and it keeps working offline once the page has loaded.
Frequently asked questions
What is SEO Site Checker for?
SEO Site Checker lets you check your input right in the browser, with the result shown instantly and nothing uploaded.
Is SEO Site Checker free to use?
Yes — SEO Site Checker is completely free, with no usage limits.
Does SEO Site Checker upload my data?
No — SEO Site Checker processes everything locally in your browser, so nothing you enter is uploaded or stored.
Why can't SEO Site Checker fetch a live URL itself?
Browsers block cross-origin requests (CORS), so SEO Site Checker analyzes response headers, curl -i output or a HAR you capture and paste — all locally.
Does SEO Site Checker work offline?
Once the page has loaded, SEO Site Checker keeps working with no network connection.