Website Security Tools
Focused checkers for every layer of your website's security stack. All free, all instant, all edge-cached.
All tools
Security Headers Checker
Test HSTS, CSP, X-Frame-Options, Referrer-Policy and Permissions-Policy in seconds.
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SSL Certificate Checker
Verify the SSL certificate for any domain in seconds.
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TLS Checker
Confirm modern TLS support for any hostname.
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Cookie Security Checker
See exactly which cookies a site drops and whether they're safe.
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CORS Checker
Detect risky CORS misconfigurations in one request.
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Redirect Checker
See exactly where a URL ends up and how it gets there.
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HTTP Header Checker
Inspect raw HTTP response headers for any URL.
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DNS Checker
All your DNS records, one clean view.
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security.txt Checker
Confirm security researchers can reach you.
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robots.txt Checker
Make sure crawlers see what you meant them to see.
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Sitemap Checker
Confirm your sitemap is discoverable and valid.
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Link Safety Checker
Answer 'is this link safe?' before you click.
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Online Port Scanner
Find open web ports on any domain in seconds — free, no signup.
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