Security Headers Checker
Paste HTTP response headers to analyze security config with grading, CSP/HSTS/cookie checks, and cross-origin policy analysis.
Security Headers Checker
Paste your HTTP response headers to analyze security configuration. Check for CSP, HSTS, X-Frame-Options, cookie flags, cross-origin policies, and more. Get a security grade with prioritized recommendations.
Paste HTTP Response Headers
Paste your HTTP response headers above to begin analysis
Get headers from curl -I https://yoursite.com or browser DevTools (Network tab → click a request → Response Headers). You can also load a sample to see how the tool works.
Frequently Asked Questions
What is the Security Headers Checker?
The Security Headers Checker is a free online tool that paste http response headers to analyze security config with grading, csp/hsts/cookie checks, and cross-origin policy analysis.. It runs entirely in your browser with no installation or sign-up needed.
What headers does it check?
CSP, HSTS, X-Content-Type-Options, X-Frame-Options, Referrer-Policy, Permissions-Policy, COOP/COEP/CORP, X-XSS-Protection, Cache-Control, and Set-Cookie security flags.
How is the grade calculated?
Each header is weighted by severity. Proper config earns full weight, misconfigured earns partial, missing earns zero. Total maps to A+ through F.
Is it safe to paste my headers?
Yes. All analysis runs in your browser. No data sent to any server.
Is the Security Headers Checker free to use?
Yes, the Security Headers Checker is 100% free with no registration, no hidden fees, and no usage limits. All processing happens locally in your browser, ensuring complete privacy.
Does the Security Headers Checker work on mobile devices?
Yes, the Security Headers Checker is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.
Do I need to create an account to use this tool?
No account or registration is needed. Simply open the Security Headers Checker in your browser and start using it immediately. There are no sign-up walls or usage restrictions.
How do I use the Security Headers Checker?
Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.
Which browsers are supported?
The Security Headers Checker works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.
Related Tools
Free Website Speed Test
Analyze website page load time, performance metrics, and optimization opportunities. Free, fast, and works entirely in your browser with no sign-up required.
Free Mobile Friendly Test
Check if your site is optimized for mobile devices. Free, fast, and works entirely in your browser with no sign-up required.
Free SSL Checker Online
Verify SSL certificate validity, check expiration, and review security configuration. Free, fast, and works entirely in your browser with no sign-up required.
Free HTTP Headers Viewer
Inspect and analyze HTTP response headers from any URL for security and caching review. Free, fast, and works entirely in your browser with no sign-up required.
About Security Headers Checker
Security Headers Checker is a free, browser-based tool in our Website Tools collection. Everything runs locally on your device — no uploads, no sign-up, and your data stays private.