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Security & Network

SSL Certificate Checker

Check SSL certificate expiry, issuer, chain and protocol for any domain

What is SSL Certificate Checker?

An SSL certificate checker connects to a domain's HTTPS port and inspects the TLS certificate. It shows the issuer (who signed it), validity period, days until expiry, TLS protocol version and the certificate fingerprint. Expired or misconfigured SSL certificates break HTTPS and can tank your search rankings.

How to Use SSL Certificate Checker

  1. 1

    Enter a domain

    Type a domain name like google.com. HTTPS prefix is added automatically.

  2. 2

    Click Check

    We connect to port 443 and inspect the TLS certificate.

  3. 3

    Review results

    See validity status, expiry countdown, issuer and protocol details.

  4. 4

    Copy details

    Copy the full certificate details for documentation.

Features

  • Certificate validity verification
  • Expiry date with countdown
  • Issuer and subject details
  • TLS protocol version
  • SHA-256 fingerprint
  • Serial number

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Frequently Asked Questions

How often should I check my SSL certificate?+
Check monthly or set up monitoring. Most Let's Encrypt certificates expire every 90 days. An expired certificate causes browser warnings and hurts SEO.
What TLS version should I use?+
TLS 1.3 is recommended. TLS 1.2 is acceptable. TLS 1.0 and 1.1 are deprecated and should be disabled.
Why does my certificate show as invalid?+
Common causes: expired certificate, hostname mismatch (certificate CN doesn't match domain), self-signed certificate, or incomplete certificate chain.
Does SSL affect SEO?+
Yes. Google has used HTTPS as a ranking signal since 2014. Sites without valid SSL certificates also show browser warnings that increase bounce rates.