Free tool

SSL certificate checker

Check any website's TLS certificate in seconds — issuer, expiry, protocol version. No signup. For continuous monitoring across all your domains, create a free account.

Issuer + chain

Inspect the certificate authority and verify the chain validates against trusted roots.

Expiry alerts

We highlight certificates that expire in under 30 days — and warn critically inside 7 days.

Protocol version

See which TLS version was negotiated. Anything below TLS 1.2 is considered insecure.