Free SSL/TLS Checker
Verify SSL/TLS configuration for any hostname
Enter any hostname to check its SSL/TLS configuration. This tool connects over HTTPS and inspects transport security headers, HSTS configuration, and certificate-related response data to identify misconfigurations that could leave your site vulnerable to man-in-the-middle attacks.
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How it works
How SSL/TLS Checker works
Enter a hostname
Type any hostname or domain name. We strip protocols and paths automatically, then connect over HTTPS.
Inspect TLS configuration
We connect to the hostname over HTTPS and analyze the response for transport security headers, HSTS policy, and certificate-related indicators.
Get security recommendations
Receive a detailed assessment of your TLS configuration with specific recommendations for improving transport security.
Features
What SSL/TLS Checker checks
HSTS policy verification
Checks whether Strict-Transport-Security is present and analyzes max-age, includeSubDomains, and preload directives that force browsers to use HTTPS exclusively.
HTTPS redirect detection
Tests whether HTTP requests are properly redirected to HTTPS and whether the redirect chain is secure, catching common misconfigurations.
Transport security header analysis
Examines all TLS-related response headers including Expect-CT, certificate pinning indicators, and protocol-related settings.
Certificate transparency check
Verifies Expect-CT header configuration and checks whether the site opts in to certificate transparency monitoring.
Use cases
Who should use the free SSL/TLS Checker
DevOps Engineers
Verify HTTPS and HSTS are correctly configured after deploying new certificates, changing CDN providers, or updating load balancer settings.
Security Teams
Audit transport security across your organization's web properties. Ensure consistent HSTS policies and proper HTTPS enforcement on all domains.
Compliance Officers
Document your TLS configuration for PCI DSS, SOC 2, and HIPAA audits that require encrypted data in transit and secure certificate management.
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Frequently asked questions
Everything you need to know about the free SSL/TLS Checker.
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