SSL Certificate Checker
Check HTTPS certificate validity, hostname match, trust chain, and common installation problems.
About this tool
Connect to a public HTTPS endpoint on port 443 and inspect the TLS certificate the server presents for the hostname you enter.
What you get
- Overall verdict with a list of problems (expiry, hostname mismatch, untrusted chain, weak crypto)
- Whether the certificate matches the hostname you checked (CN / SAN / wildcard)
- Expiry dates, issuer, public key, signature algorithm, and negotiated TLS version when available
- Full SAN list, certificate chain, and hostnames from certificate transparency logs when available
How to use
Enter the hostname only (no https:// path). Only check hosts you are allowed to probe.
FAQ
How to check SSL certificate expiry?
Enter a hostname to connect over HTTPS and read not-before and not-after dates plus days remaining before renewal is due.
How to verify if a certificate is trusted?
The verdict covers chain completeness, trust anchor validation, hostname match, and weak cipher or protocol issues in plain language.
What does an SSL checker show for a website?
You get an overall pass/fail summary, certificate and chain tables, SAN names, protocol details, and a list of actionable issues.
How to find certificate transparency hostnames?
The report lists publicly logged hostnames seen for the site—useful for discovering forgotten subdomains and mis-issued certs.
By using this tool you agree to our Terms of Use and Privacy Policy. Results are provided as-is without warranty.