How to use Website Downtime Checker
- Give Website Downtime Checker response headers, cURL -i output or a HAR to work from.
- Hit Analyze and Website Downtime Checker computes the result client-side.
- Review the parsed redirect chain and security-header audit shown below.
About this tool
Everything Website Downtime Checker does happens on your own device. Website Downtime Checker reconstructs a redirect chain and status codes from response headers, a curl -i dump or a HAR you capture in DevTools.
It also audits the final response for security headers such as HSTS, CSP and X-Content-Type-Options. It behaves the same on desktop and mobile, with nothing stored remotely.
Frequently asked questions
What is Website Downtime Checker for?
Use Website Downtime Checker to check your input without installing anything; everything happens client-side.
Is Website Downtime Checker free to use?
Yes — Website Downtime Checker is completely free, with no usage limits.
Where is my data processed by Website Downtime Checker?
Entirely in your browser — Website Downtime Checker keeps your data on your own machine and sends nothing anywhere.
Why can't Website Downtime Checker fetch a live URL itself?
Browsers block cross-origin requests (CORS), so Website Downtime Checker analyzes response headers, curl -i output or a HAR you capture and paste — all locally.
Does Website Downtime Checker work offline?
Once the page has loaded, Website Downtime Checker keeps working with no network connection.