Security Headers Validator
Analyze a site's HTTP security headers (CSP, HSTS, X-Frame-Options and more) and get recommendations to harden security.
Analyze a site's HTTP security headers (CSP, HSTS, X-Frame-Options and more) and get recommendations to harden security.
Free HTTP security headers analysis for any website — CSP, HSTS, X-Frame-Options and more, with recommendations.
Run it after DNS and SSL are validated in production — missing headers often signal incomplete hardening, not necessarily an MVP blocker.
You get a clear diagnosis of what is present, what is missing and how to improve your site's security posture.
Quick reference for pre and post-deploy audits. Presence does not mean perfect config, but absence widens the attack surface.
| Term | Meaning |
|---|---|
| Strict-Transport-Security | Present: enforces HTTPS. Missing: downgrade risk on first visit. |
| Content-Security-Policy | Present: limits script/style sources. Missing: higher XSS risk. |
| X-Frame-Options | Present: reduces clickjacking. Missing: site may load in malicious iframes. |
| X-Content-Type-Options | Present: nosniff enabled. Missing: MIME sniffing possible. |
| Referrer-Policy | Present: controls URL leakage. Missing: full referrers may expose internal paths. |
Quick lookups for well-known domains:
They are headers sent by the server that instruct the browser to apply protection policies, helping mitigate attacks such as XSS, clickjacking and content injection.
CSP defines which content sources the browser may load and is one of the most effective defenses against cross-site scripting (XSS) attacks.
Strict-Transport-Security (HSTS) forces the browser to always use HTTPS for the domain, protecting against downgrade and interception attacks.
It controls whether the site can be displayed inside iframes, helping prevent clickjacking attacks.
Yes. The XploreNetHub Security Headers Validator is free and requires no sign-up.
HSTS, X-Content-Type-Options and X-Frame-Options (or frame-ancestors in CSP) are the most common trio. Full CSP depends on your app stack.
No. Most sites run without CSP or HSTS, but security posture is weaker. Fix early on public APIs and apps.