Certificate expiration
Shows the certificate's validity dates and days left until expiry.
W1SYS FREE TOOLS
SSL Certificate Checker
Check certificate expiration, issuer, hostname validity and the certificate chain your website sends.
CERTIFICATE RESULTS
Results
Presented certificate chain
Certificates received from the server, in order. This does not prove every client will build or trust the same chain.
What this tool checks
Issuer and identity
Shows the certificate authority, names covered and whether the hostname matches.
TLS trust test
Attempts a separate certificate-verified TLS connection using the server's trust store.
Chain inspection
Lists certificates the server actually sends. Missing roots may be normal.
The domain you check is sent to the W1SYS server so it can inspect the public HTTPS endpoint. No login required. Results are not saved by this tool.