HTTP Header Checker
Featured
Inspect HTTP response headers for a URL.
- On your device
- No signup
SEO & Webmaster
Utilnivo
Security Headers Checker
Check CSP, HSTS, and other security response headers.
No registration
- On your device
Browse more in SEO & Webmaster or all tools.
Private on your device
Your information stays on your device and is not uploaded.
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Enter a URL to inspect security-related HTTP response headers such as Content-Security-Policy, HSTS, X-Frame-Options, and Referrer-Policy.
How to use this tool
1. Enter a page URL. 2. Run the checker to read response headers when your browser allows. 3. Review which security headers are present or missing. 4. Add missing headers in your hosting or CDN settings.
Worked example
Example: a site missing strict-transport-security gets a note to enable HSTS for HTTPS enforcement.
How it works
Fetch HTTP response headers from a URL and check for common security headers such as CSP, HSTS, X-Frame-Options, and Referrer-Policy.
Limitations
Response headers are read via browser requests. Cross-origin policies may hide some header values.
Privacy and file handling
Your data stays on your device and is not uploaded.
FAQ
Frequently asked questions
Is Security Headers Checker free?
Yes. It is free to use and you do not need to sign in or create an account.
Is my data private?
See the privacy note on this page. Many tools run on your device; some heavier file tools may use secure temporary processing when required.
Can I use Security Headers Checker on mobile?
Yes. Open this page on your phone or tablet, enter your inputs, and use the on-screen controls.
Part of these workflows
This tool is one step in a longer job. Jump straight to your step or open the full workflow guide.
Related pages
- Crawl, headers, and performance — compare seo tools and read FAQs
- Site performance SEO tools — compare seo tools and read FAQs
- Pre-launch domain and TLS check — step-by-step workflow
- Technical SEO health pass — step-by-step workflow
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- HTTP Header Checker — Inspect HTTP response headers for a URL.
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