Test your website's security for free

Our security header check evaluates the HTTP response headers your website sends to a browser. These specialised headers act as a primary line of defense, hardening your site against common cyberattacks like Cross-Site Scripting (XSS), clickjacking, and unintended data leaks. Find out how secure your business is with our Free HTTP Header Scanner.

Security Header Scanner

Enter any website URL to instantly check its HTTP security headers and receive a grade from A+ to F.

A+

This assessment analyses a single URL using AI-driven security analysis, so results should be treated as technical guidance rather than an absolute security guarantee.

What Are Security Headers?

Security headers, also known as HTTP response headers, are small pieces of information sent by a web server to a visitor’s browser. Their purpose is to improve website security by controlling how browsers behave when loading content. While invisible to most users, these headers play an important role in protecting websites from common cyber threats such as code injection, clickjacking, and data theft, helping reduce vulnerabilities and improve overall trust, privacy, and browsing security for website visitors.

Why Security Headers Matter

Without properly configured security headers, websites can become more vulnerable to attacks that exploit browser behaviour. Security headers help create an additional layer of defence by instructing browsers to block suspicious activity, enforce secure connections, and restrict how external content is loaded. They are considered a core part of modern website security and are often recommended as part of cybersecurity best practice and compliance standards.

Common Types of Security Headers

Several security headers are widely used to strengthen website protection. For example, Content-Security-Policy (CSP) helps prevent malicious scripts from running, while Strict-Transport-Security (HSTS) forces browsers to use secure HTTPS connections. Other headers such as X-Frame-Options, Referrer-Policy, and X-Content-Type-Options help protect against clickjacking, information leakage, and file-type spoofing. Together, these headers help reduce the attack surface of a website.

Security Headers as Part of a Wider Strategy

Security headers are not a complete cybersecurity solution on their own, but they form an essential part of a wider security strategy. When combined with SSL certificates, regular updates, secure hosting, monitoring, and vulnerability management, they help create a safer and more trustworthy online experience. Properly configured headers also demonstrate a proactive approach to website security, helping build confidence with users, clients, and search engines alike.