Free tool

SSL certificate checker.

Enter a hostname or URL. SelfSignedCert completes a TLS handshake with that host and shows the public leaf certificate — subject, issuer, dates, SANs, and fingerprints. This is the one tool that leaves your browser: we connect to the site you name. We do not store the lookup, and no private key is ever sent.

Already have a PEM file? Decode a certificate locally or generate a new self-signed SSL certificate.