SEO & Webmaster
Security Headers Checker
- Browser-based
- No signup
Browser-based
Enter a URL to inspect security-related HTTP response headers such as Content-Security-Policy, HSTS, X-Frame-Options, and Referrer-Policy.
Response headers are read via browser requests. Cross-origin policies may hide some header values.
How to use this tool
1. Enter a page URL. 2. Run the checker to read response headers (when CORS allows). 3. Review which security headers are present or missing. 4. Add missing headers in your server or CDN config.
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 is processed in your browser and is not uploaded to our server.
Frequently asked questions
Is the Security Headers Checker free to use?
Yes. Utilnivo tools are free to use and do not require an account.
Are my inputs stored?
Utilnivo does not require an account. See the privacy note on this page for how your data is processed for this tool.
How do I get started with Security Headers Checker?
Open the tool on this page, enter your inputs, and use the on-screen controls. No account is required.
Related tools
Related pages
- Crawl, headers, and performance — compare seo tools and read FAQs
- Browse all free online tools on Utilnivo
- Explore more seo tools on Utilnivo
- HTTP Header Checker — Inspect HTTP response headers for a URL.
- HTTP Status Checker — Check the HTTP status code for a URL.
- Redirect Checker — Inspect redirect hops and the final destination URL.
- Core Web Vitals Explainer — Learn what LCP, INP, and CLS mean for page experience.
- Canonical Tag Checker — Find and validate canonical link tags on a page.
Page last reviewed: