What is a TLS/SSL certificate check?

Every HTTPS website presents a TLS (formerly SSL) certificate to prove its identity and encrypt traffic. That certificate has an expiration date, a chain of issuing authorities, and must be signed by a certificate authority your browser trusts - if any of that is wrong, visitors see security warnings.

Tool Description

The TLS/SSL Certificate Checker connects directly to a remote host and port from our server and performs a real TLS handshake, then reports back what certificate the server presented - without exposing your own IP address or requiring any local tools.

Features

  • Server-Side Handshake: Our server connects to the target host and port, so nothing runs in your browser or reveals your IP
  • Expiry Tracking: Shows validity dates and days remaining, and flags expired or soon-to-expire certificates
  • Trust Status: Reports whether the certificate chain is trusted and, if not, why
  • Full Chain: Lists every certificate in the chain, from the leaf up to the root, including self-signed roots
  • Connection Details: Surfaces the negotiated TLS protocol version and cipher suite
  • Safe by Design: Only public hostnames and IP addresses can be checked - requests to private, loopback, and internal network ranges are rejected