How to use Check if a Website Is Down
- Give Check if a Website Is Down response headers, cURL -i output or a HAR to work from.
- Press Analyze to run it locally in your browser.
- Use the parsed redirect chain and security-header audit Check if a Website Is Down produces — nothing was uploaded.
About this tool
Check if a Website Is Down runs entirely in your browser. Check if a Website Is Down 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. Nothing you enter is uploaded, and it keeps working offline once the page has loaded.
Frequently asked questions
What does Check if a Website Is Down do?
Check if a Website Is Down runs entirely on your device: add your input, and it checks it locally in real time.
Does Check if a Website Is Down cost anything?
No — Check if a Website Is Down is completely free, with no sign-up and no hidden limits.
Does Check if a Website Is Down upload my data?
No — Check if a Website Is Down processes everything locally in your browser, so nothing you enter is uploaded or stored.
Why can't Check if a Website Is Down fetch a live URL itself?
Browsers block cross-origin requests (CORS), so Check if a Website Is Down analyzes response headers, curl -i output or a HAR you capture and paste — all locally.
Can I use Check if a Website Is Down without a connection?
Yes — after the first load Check if a Website Is Down runs entirely offline.