Security Header Checker
Check any public website's HTTP security headers (HSTS, CSP, X-Frame-Options, cookie flags, and more) in seconds.
Quick Reference & Instructions
Simple steps, pro tips, and execution details
Provide Inputs
Type, paste, or select your values in the form fields below.
Instant Live Analysis
Calculations and formatting happen automatically with zero delay as you type.
Copy or Use Output
Copy results or apply the clean output directly to your projects.
How It Works
Fetches the page's response headers and checks them against common security header best practices. This is a security assessment, not a penetration test - it never attempts logins, exploits, or destructive checks.
Frequently Asked Questions
Common questions about calculations, assumptions, and edge cases.
No. This tool only reads public HTTP response headers - it never attempts to log in, exploit, or scan for vulnerabilities.
Related Tools
Explore all seo tools →SEO Audit Tool
Crawl any public page and get a scored, prioritized SEO audit: title/meta, headings, links, images, Open Graph, structured data, and more.
SSL/TLS Certificate Checker
Check any domain's SSL certificate validity, expiration date, issuer, and HTTPS/HSTS configuration.