HTTP Security Headers Checker
Scan any URL and get an instant security headers grade — with plain-English explanations and copy-paste remediation snippets.
Security headers don't stop bots or scrapers
Headers protect against specific browser-level attacks (clickjacking, MIME sniffing, XSS injection). They don't stop bots, scrapers, or credential stuffing — those operate at the traffic layer, before browsers get involved. See traffic-layer protection →
Frequently asked questions
What are security headers?
HTTP security headers are response headers that instruct browsers how to behave when handling your site's content — for example, refusing to load it inside an iframe (X-Frame-Options), requiring HTTPS for future visits (HSTS), or restricting which scripts can run (CSP). They protect against specific classes of attack like clickjacking, MIME sniffing, and certain XSS vectors.
Does a perfect grade mean my site is fully protected?
No — security headers address browser-level threats. They don't stop bots, scrapers, credential stuffing, or application-layer DDoS, which operate at the traffic layer before browsers are involved. See our website protection overview for the fuller picture.
Do you store the URLs I scan?
Yes — we log the URL scanned and the resulting grade to analyse tool usage and qualify leads. We don't crawl or store your site's content. See our Privacy Policy for full details.
Security headers are one layer. Want full traffic-layer protection?
Sign up free — connect your site in minutes, no commitment, no CAPTCHA friction added during evaluation.