speedtest.it

SSL/TLS · Certificate chain

SSL Checker

Verify any domain's SSL certificate: expiration, issuer, and full security chain.

What is an SSL Certificate?

An SSL/TLS certificate authenticates a website's identity and encrypts the connection between the browser and server. It's what makes HTTPS possible.

What this tool checks

  • Validity — whether the certificate is currently valid
  • Expiration — when it expires (alerts for < 30 days)
  • Issuer — the Certificate Authority (CA) that issued it
  • Chain — full trust chain verification