What is a Security Headers Checker?
A Security Headers Checker scans a website's HTTP response headers and evaluates which security-related headers are present, missing, or misconfigured.
Our free Security Headers Checker provides a clear, actionable report to help you understand and improve your site's header configuration.
HTTP security headers are response headers a server sends that instruct the browser how to handle a site more securely, covering things like preventing clickjacking attacks, enforcing HTTPS connections, and restricting which scripts are allowed to execute on a page, all configured through headers rather than through the page's actual content.
Our Security Headers Checker scans a website and evaluates which of these recommended headers are present, missing, or potentially misconfigured, returning a clear report you can act on. A lower grade on this kind of check specifically means several recommended headers, like Content-Security-Policy or Strict-Transport-Security, are either missing or configured in a way that doesn't provide their intended protection; it doesn't necessarily mean a site is actively being exploited, but it does mean the site is under-hardened relative to current best practice.
Not every recommended header is equally necessary for every single site; a strict Content-Security-Policy in particular takes real, careful effort to configure correctly without breaking legitimate site functionality, and may not fit every application's specific needs the same way. Prioritizing the headers most relevant to your specific application's actual risk profile makes more sense than mechanically implementing every possible header regardless of fit. It's also worth knowing that security headers add genuinely negligible overhead to page load time, since they're simply additional response header fields rather than extra content or processing that would meaningfully affect rendering speed, so there's little practical downside to implementing the ones that do fit your site.
Why Use a Security Headers Checker?
- ✅ Identify Missing Headers — Find gaps in your site's header configuration
- ✅ Improve Security Posture — Add headers that prevent common attack types
- ✅ Get Actionable Feedback — See exactly which headers need attention
- ✅ Verify After Changes — Confirm new header configurations are working correctly
- 🧾 Scanned Instantly, Free
Features & Capabilities
- Comprehensive Header Analysis — Checks for all commonly recommended security headers
- Clear Grading — Understand your site's overall header configuration at a glance
- Actionable Recommendations — Get specific guidance on what to add or fix
- Instant Results — Get a full report in seconds
- Scan as Many Sites as You Like — Free, no login
Who Uses a Security Headers Checker?
- Web Developers — Verify header configuration before and after deployment
- Security Professionals — Audit site header hardening as part of a review
- IT Teams — Ensure company websites follow current best practices
- DevOps Engineers — Integrate header checks into deployment workflows
- Small Business Owners — Verify their site follows recommended security practices
SEO & Performance Benefits
- 🧾 Stronger Security Posture — Close common, easily overlooked configuration gaps
- 🗂️ Clear Prioritization — Know exactly which headers matter most for your site
- ⚡ Time-Efficient — Scan a site in seconds instead of manual header inspection
- 💻 Always Available — Works from any browser, any device
- 🎟️ Free to Use — No subscription needed for standard scans
Best Practices for Using a Security Headers Checker
- Prioritize by Actual Risk — Not every header fits every application equally
- Test Content-Security-Policy Carefully — Misconfiguration can break legitimate functionality
- Rescan Regularly — Verify headers remain correctly configured over time
- Don't Treat a Perfect Score as Complete Security — Headers are one layer among several
- Document Your Header Configuration — Keep a record for future reference and audits