SSL/TLS Certificate Expiry Checker
Inspect a site's live TLS certificate: issuer, subject, protocol, validity dates and days until expiry.
Makes a real TLS connection from our server, so you see the certificate visitors get.
How to use this tool
Use this to confirm that a domain serves a valid HTTPS certificate and to see how long is left before it expires.
- Enter the domain in the domain box.
- Press Probe Live DNS & TLS.
- Read the SSL / TLS Certificate Handshake panel.
- Renew the certificate if the days remaining are low or the status says Not valid.
What it checks
- Valid or Not valid status, with the TLS protocol when valid.
- The problem text when the handshake fails.
- The certificate issuer.
- The certificate subject.
- Days remaining until expiry.
Questions
Does it list Subject Alternative Names or the full chain?
No. This page shows status, protocol, issuer, subject and days remaining only.
Does it check HTTPS redirects?
No. It inspects the certificate only and does not test whether HTTP redirects to HTTPS.
Why does it also show DNS records?
One button runs both the DNS and certificate lookups for the same domain.