How to use Web URL Checker
- Paste or load response headers, cURL -i output or a HAR into Web URL Checker.
- Press Analyze to run it locally in your browser.
- Review the parsed redirect chain and security-header audit shown below.
About this page
There is no server behind Web URL Checker. Web URL 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. Nothing you enter is uploaded, and it keeps working offline once the page has loaded.
Frequently asked questions
What is Web URL Checker for?
Web URL Checker lets you check your input right in the browser, with the result shown instantly and nothing uploaded.
Is Web URL Checker free to use?
Yes — Web URL Checker is completely free, with no usage limits.
Is my input private in Web URL Checker?
Yes — your input never leaves your device; Web URL Checker does all the work in your browser.
Why can't Web URL Checker fetch a live URL itself?
Browsers block cross-origin requests (CORS), so Web URL Checker analyzes response headers, curl -i output or a HAR you capture and paste — all locally.
Can I use Web URL Checker without a connection?
Yes — after the first load Web URL Checker runs entirely offline.