SitePrivacyScore
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Free Security Headers Checker

Test any website's HTTP response headers to see if critical security protections like CSP, HSTS, and X-Frame-Options are fully configured.

What Are HTTP Security Headers?

HTTP security headers are directives sent by your web server in every response. They instruct the visitor's browser how to handle your content, which scripts to run, whether to allow framing, and how to enforce encrypted connections. Without them, browsers fall back to insecure defaults.

This free tool checks six of the most important headers. For a complete server-side and client-side security analysis covering cookies, trackers, consent mechanisms, and data exposure, use the full SitePrivacyScore audit.

Related Tools and Guides

CSP Generator, Build a Content Security PolicyReferrer Policy Checker, Test Referrer LeakageRead Guide: Understanding HTTP Security Headers

See the complete security picture

Security headers are just one layer. A full SitePrivacyScore audit also checks trackers, cookies, consent banners, PII exposure, and more, all in one scan.

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Frequently Asked Questions

What are HTTP security headers?+
Security headers are directives included in HTTP responses from your web server. They tell the browser how to behave when handling your content, for example, which scripts are allowed to run (CSP), whether the page can be framed (X-Frame-Options), or whether to enforce HTTPS (HSTS).
Why does Content-Security-Policy (CSP) matter?+
CSP is one of the most powerful defenses against Cross-Site Scripting (XSS). It tells browsers exactly which domains can load scripts, styles, images, and other resources. Without it, an attacker who injects malicious code into your page can execute it freely.
What is Strict-Transport-Security (HSTS)?+
HSTS tells the browser that it should only communicate with your site over HTTPS, even if the user types http:// in the address bar. This prevents man-in-the-middle downgrade attacks where an attacker intercepts the initial insecure request.
What does X-Frame-Options protect against?+
X-Frame-Options prevents your page from being loaded inside an iframe on another website. Without it, attackers can overlay invisible frames on top of legitimate buttons, tricking users into clicking actions they didn't intend, a technique called clickjacking.
Is checking security headers enough for a full security audit?+
No. Security headers are an important first defense, but they don't cover backend vulnerabilities, authentication weaknesses, third-party script risks, or data exposure. A full privacy and security scan provides significantly deeper coverage.
How do I add missing security headers to my website?+
You configure them on your web server (Apache, Nginx, Cloudflare, Vercel, etc.) or via your application framework's middleware. Each hosting provider has slightly different configuration methods, search for your specific stack plus the header name.