SSL Certificate Checker
Verify SSL & TLS
Check SSL certificate validity, issuer, expiration date, and certificate chain for any website securely
Frequently Asked Questions
What is an SSL Certificate?
An SSL (Secure Sockets Layer) certificate is a digital certificate that authenticates a website's identity and enables an encrypted connection. It ensures that data passed between the web server and the browser remains private and secure.
How can I tell if my SSL certificate is valid?
A valid SSL certificate must be issued by a trusted Certificate Authority (CA), not be expired, and the domain name on the certificate must perfectly match the website you are visiting. This tool checks all these parameters automatically.
What is a Certificate Chain?
A certificate chain is an ordered list of certificates, starting with your website's server certificate and terminating with a trusted root certificate. The intermediate certificates in between act as a bridge of trust from the CA to your server.
Why did my SSL connection fail to authorize?
Common reasons include: the certificate has expired, the certificate is self-signed (not issued by a trusted authority), the domain name doesn't match the certificate, or the intermediate certificate chain is broken/missing.
What is a SAN (Subject Alternative Name)?
SAN allows you to specify additional hostnames (like subdomains or entirely different domains) to be protected by a single SSL certificate. This is commonly used in multi-domain or wild-card certificates.