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SSL Expiry Checker

See how many days remain until a certificate expires.

What Is a SSL Expiry Checker?

The SSL Expiry Checker tells you how many days remain until a hostname's TLS certificate expires. It connects to the server, reads the certificate, and shows the expiry countdown, the certificate's issue and expiry dates, plus the expiry of each certificate in the chain. Certificates expiring within 30 days are flagged as expiring soon.

How to Use This SSL Expiry Checker

  1. 1
    Enter a hostnameType the domain you want to check.
  2. 2
    Click CheckThe tool connects and reads the certificate.
  3. 3
    View the countdownSee days remaining and whether each cert in the chain is healthy.

Frequently Asked Questions

An expired certificate causes browsers to show security warnings and can break HTTPS connections. Monitoring expiry prevents outages and loss of user trust.
Most certificate authorities issue certificates that expire after a few months. Renewing at least 30 days before expiry is a common best practice.
The tool opens a TLS connection to the host on port 443 and reads the certificate and chain directly from the server.

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