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SSL Certificate Checker

Free SSL certificate checker — see the issuer, validity dates and days until expiry of any domain HTTPS certificate, plus a quick HTTPS/HTTP behavior check.

How it works

  1. Enter a domain like example.com.
  2. We open a TLS connection and read the live certificate the server presents.
  3. Review the issuer, validity window and days left — renew before it expires.

Features

  • Live TLS handshake reads the real certificate in use
  • Issuer, subject, valid-from and valid-to dates
  • Days remaining with clear expiry thresholds
  • No signup; results cached for 12 hours

FAQ

How does the SSL checker work?
It connects to port 443 of the domain, performs a TLS handshake and parses the certificate the server presents — the same one your visitors trust.
Why does certificate expiry matter?
When a certificate expires, browsers show a full-page security warning and visitors leave. Monitoring the days left prevents downtime.
What if the check fails?
No certificate means HTTPS is not configured on port 443; some sites only serve through a CDN proxy. Check with your host or CDN provider.
Is it free?
Yes, completely free with no signup. Successful results are cached for 12 hours.

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