About
Reads the certificate a public HTTPS host presents during TLS: subject, issuer, and expiry.
How to use
Enter a hostname without a path, for example example.com.
What this tool checks
Public fields on the peer certificate: subject, issuer, expiry. Use them to confirm the name matches the certificate.
How to read the results
Issuer should be the CA you expect. Renew in your certificate platform when expiry is close, instead of refreshing this page.
Limits and data handling
The TLS handshake starts from the server. Private keys are not stored and certificates are not installed for you.
FAQ
Does expiry always block the site?
Browsers warn or block, but some clients still connect. Expiry still means you should renew.
Does it grade vulnerabilities?
This tool shows certificate fields. It is not a full SSL Labs-style grade.
What is SNI?
Multiple HTTPS sites on one IP pick a certificate by hostname. Enter the correct name, not just an IP.
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