Why does an SSL certificate expire?

Certificates have limited lifetimes so keys and domain validation can be renewed. The actual expiry date is read from the certificate; lifetimes vary by issuer and current policy.

TLS 1.3 / 1.2 Cryptographic Verifier

SSL Certificate & Expiration Checker

Verify SSL certificate validity, days remaining until expiry, Certificate Authority (CA), and SAN hostnames.

Chain, hostname and dates are verified against our server trust store. Revocation status, all supported ciphers and browser-specific trust are not tested. This is a one-time check, not an expiry alert service.

FAQ

Frequently Asked Questions

Questions about network tools and interpreting results.

An SSL (Secure Sockets Layer) / TLS (Transport Layer Security) certificate encrypts data transferred between a user's web browser and your web server, protecting sensitive information like login credentials and credit card numbers.