SSL Certificate Checker
Check the HTTPS certificate of any domain to see whether it is still trusted, who issued it, when it expires and which hostnames it actually covers.
Expired or misconfigured SSL certificates create browser warnings, lost visitor trust and even search ranking drops.
This tool reads the public certificate directly and shows the expiry, issuer, SAN hostnames and whether the certificate looks self-signed.
It is a quick check, not a replacement for a full HTTPS or infrastructure review when the site is business-critical.
Run the check
Enter the domain to see whether its HTTPS certificate is valid, who issued it, when it expires and which hostnames it covers.
What this check does
- Opens a real TLS handshake to the public domain and reads the served certificate.
- Shows the issuer, subject and exact expiry date of the certificate.
- Lists the hostnames covered by the certificate (SAN entries).
- Flags self-signed certificates and certificates that are expired or close to expiry.
Important limits
- It reads the certificate currently served on port 443 only.
- It does not validate the full trust chain or revocation status.
- A valid certificate does not guarantee the full site loads correctly over HTTPS.
- For mixed-content or browser-warning issues, a full review is still the safer next step.
Need the certificate fixed properly?
If visitors are already seeing certificate warnings, the safer path is to review the SSL automation, Nginx or Apache config and the certificate chain directly instead of relying on quick checks.