SEO Analysis Checker.com

Security headers checker

Free security headers checker

The right HTTP response headers turn a browser into an active partner in defending your site — forcing HTTPS, blocking clickjacking, shutting down cross-site scripting, and limiting what data leaks to third parties. They cost nothing to add and are among the highest-leverage security wins available, yet a large share of sites ship without them because they are invisible unless you go looking.

This checker fetches your URL and grades the six headers that matter most: Strict-Transport-Security (HSTS), Content-Security-Policy, X-Content-Type-Options, X-Frame-Options, Referrer-Policy and Permissions-Policy. You get a letter grade and a 0–100 score, plus a per-header breakdown that explains what each one protects against and hands you a copy-ready directive to fix anything missing. Because HTTPS is a Google ranking signal and a hacked or malware-flagged site can be dropped from the index entirely, security posture and SEO are more connected than they look. Harden the headers here, then run the full audit to see how the rest of your page performs for search and AI.

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Enter a URL to grade its HTTP security headers — HSTS, CSP, X-Frame-Options and more — with a letter grade and copy-ready fixes.

How it works

Fast, transparent, no signup

  1. Enter a URL — the tool fetches it server-side and reads the response headers.
  2. Review the letter grade and the pass/fail breakdown for each security header.
  3. Copy the suggested directives, add them at your server or CDN, and re-run to confirm.

FAQ

Questions people ask about this tool

What are HTTP security headers?

Security headers are response headers your server sends that instruct the browser to enforce protections: forcing HTTPS (HSTS), restricting where resources load from (Content-Security-Policy), blocking iframe embedding (X-Frame-Options), and more. They are one of the cheapest, highest-impact ways to harden a site.

Do security headers affect SEO?

Indirectly but meaningfully. HTTPS is a confirmed ranking signal, and HSTS enforces it. A strong security posture reduces the risk of hacks and malware that can get a site flagged in Google Safe Browsing and de-indexed. Headers also improve user trust and, with CSP, can reduce the blast radius of injected content.

How is the grade calculated?

Each header is weighted by impact — HSTS and Content-Security-Policy count most, followed by X-Content-Type-Options and X-Frame-Options, then Referrer-Policy and Permissions-Policy — for a score out of 100. The letter grade (A, B, C or F) reflects how many of those weighted protections you have in place.

Where do I add these headers?

Set them at your web server (Nginx, Apache), your framework, or — easiest — your CDN/edge (Cloudflare, Vercel, Netlify). Each result includes a copy-ready directive. Add the missing ones, deploy, and re-run this checker to confirm they are live.