How to use Website Down Checker
- Paste or load response headers, cURL -i output or a HAR into Website Down Checker.
- Hit Analyze and Website Down Checker computes the result client-side.
- Review the parsed redirect chain and security-header audit shown below.
About this tool
Website Down Checker is a static, client-side tool with no backend. Website Down 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, Website Down Checker works from captured headers rather than fetching the URL itself. No data is sent anywhere, so it stays fast and private by default.
Frequently asked questions
How do I use Website Down Checker?
Use Website Down Checker to check your input without installing anything; everything happens client-side.
Does Website Down Checker cost anything?
No — Website Down Checker is completely free, with no sign-up and no hidden limits.
Does Website Down Checker upload my data?
No — Website Down Checker processes everything locally in your browser, so nothing you enter is uploaded or stored.
Why can't Website Down Checker fetch a live URL itself?
Browsers block cross-origin requests (CORS), so Website Down Checker analyzes response headers, curl -i output or a HAR you capture and paste — all locally.
Does Website Down Checker work on mobile?
Yes — Website Down Checker is just a web page and runs on any modern browser, including phones and tablets.