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HTTP Headers Checker

Developer Tools

Check HTTP response headers for any URL.

⚡ Instant🔒 Private, in your browser🆓 Free, no sign-up👥 For developers
Your data never leaves your browser. We do not store inputs.

What HTTP Headers Checker does

HTTP Headers Checker fetches a URL and lists every response header it returns — content type, caching directives, security headers like CSP and HSTS, server info, and more. Enter any public URL to see exactly what headers a site is sending, useful for debugging caching issues or auditing security configuration.

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Reviewed by the FreeToolsVerse team · Last updated · How we check our tools

How to use HTTP Headers Checker

  1. Enter the URL you want to inspect
  2. Click Check Headers
  3. Review the full list of response headers and their values
  4. Re-check after making server changes to confirm headers updated

Who should use it

Made for developers. Typical uses:

  • Auditing a site's security headers (CSP, X-Frame-Options, HSTS) after a server configuration change
  • Debugging why a browser isn't caching a resource by checking its Cache-Control and Expires headers
  • Verifying a CDN or reverse proxy is adding or forwarding the expected headers

Frequently asked questions

Is HTTP Headers Checker free to use?
Yes, completely free.
Is my data uploaded anywhere, and is this private?
The tool sends a request to the URL you enter to fetch its headers — it doesn't upload any files, but checking a URL is inherently a live lookup, not a purely local operation.
Why do the headers I see differ from what my browser shows?
Some headers vary based on request method, user agent, or CDN edge location, so results can differ slightly from your own browser's network tab.
Can I check any public URL?
Yes, any URL that's publicly reachable over HTTP or HTTPS.
What are security headers and why do they matter?
Headers like Content-Security-Policy and Strict-Transport-Security tell browsers how to handle a site defensively, reducing risks like XSS and man-in-the-middle attacks.

Learning resources

Explore more in Developer Tools, read the guides and articles, or see how we test our tools.

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