Certificate Decoder

Paste a PEM-encoded certificate to decode and inspect its contents. View subject, issuer, validity period, SANs, key details, and more.

Certificate (PEM format)

You can extract a certificate from a website using OpenSSL:

openssl s_client -connect example.com:443 -servername example.com < /dev/null 2>/dev/null | openssl x509

Or export it from your browser by clicking the padlock icon and viewing certificate details.