How to use Website Downtime Check
- Paste or load response headers, cURL -i output or a HAR into Website Downtime Check.
- Press Analyze to run it locally in your browser.
- Review the parsed redirect chain and security-header audit shown below.
About this tool
Everything Website Downtime Check does happens on your own device. Paste the headers, curl -i output or HAR you captured and Website Downtime Check maps the hops and status codes locally.
Because browsers block cross-origin live requests, Website Downtime Check 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
How do I use Website Downtime Check?
Website Downtime Check runs entirely on your device: add your input, and it checks it locally in real time.
Does Website Downtime Check cost anything?
No — Website Downtime Check is completely free, with no sign-up and no hidden limits.
Where is my data processed by Website Downtime Check?
Entirely in your browser — Website Downtime Check keeps your data on your own machine and sends nothing anywhere.
Why can't Website Downtime Check fetch a live URL itself?
Browsers block cross-origin requests (CORS), so Website Downtime Check analyzes response headers, curl -i output or a HAR you capture and paste — all locally.
Can I use Website Downtime Check without a connection?
Yes — after the first load Website Downtime Check runs entirely offline.