Decode and analyze SSL/TLS certificates with detailed certificate information and security analysis
Enter the domain or URL you want to analyze. The tool will connect to the server via HTTPS.
Our system retrieves and decodes the SSL/TLS certificate, extracting all relevant information.
Review certificate details, expiry dates, HSTS configuration, and receive a security grade.
View all certificate details including issuer, validity dates, SANs, key size, and fingerprints.
Check HTTP Strict Transport Security configuration including max-age, subdomains, and preload status.
Get an overall security grade with identified issues and warnings about certificate configuration.
An SSL/TLS certificate is a digital certificate that authenticates a website's identity and enables an encrypted connection. It ensures that data transferred between the web server and browser remains private and secure.
The security grade (A+ to F) reflects the overall SSL/TLS configuration quality, including protocol version, cipher strength, certificate validity, and security features like HSTS. A+ indicates excellent security configuration.
SANs are additional domains and subdomains that are covered by the SSL certificate. They allow a single certificate to secure multiple domains, making certificate management easier.
HTTP Strict Transport Security (HSTS) forces browsers to only connect to your site via HTTPS, preventing downgrade attacks and ensuring all connections are encrypted. It's a critical security feature.
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