Back to Tools
SSL Certificate Decoder
Paste an SSL certificate (PEM format) to decode and display issuer, subject, validity period, SANs, and algorithm details.
Certificate Information
Basic Information
Validity Period
Public Key
Fingerprints
Extensions
What Is an SSL Certificate Decoder?
An SSL decoder parses the Base64-encoded (PEM) certificate and displays its contents in human-readable form. Certificates contain the subject, issuer, validity period, public key, signature algorithm, extensions, and SAN entries. This tool converts -----BEGIN CERTIFICATE----- blocks into structured data without requiring OpenSSL.
CLI Equivalent
openssl x509 -in cert.pem -text -noout