About the HTTP Header Checker Online Free Tool

The HTTP Header Checker Online Free Tool analyzes pasted raw HTTP response headers and reports security-relevant header presence. It helps review Content-Security-Policy, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy.

How to Use the HTTP Header Checker Online

1. Paste raw response headers in Header: Value format.
2. Load the sample if you want to see the expected input style.
3. Analyze the headers.
4. Review detected headers and missing security recommendations.

Choosing Options Correctly

Paste response headers from the final URL after redirects. Security headers can differ between CDN, app, and static asset responses.

Common Use Cases

• Audit security headers for a web page.
• Compare production and staging response headers.
• Prepare header fixes for deployment notes.

Quick FAQ

Does this fetch headers from a URL?
No. Paste raw headers from browser devtools, curl, or another HTTP client.

Does every site need every listed header?
No. Treat the report as a review checklist and apply headers according to the site architecture.

Which response should I paste?
Paste the final response you want to review, especially after redirects if you are checking security headers on the landing page.

Can it fix server headers?
No. It explains the pasted headers; changes must be made in your server, CDN, proxy, or application config.