SSL Certificate Decoder
// Decode PEM certificates and show details
SubjectCN=Example
IssuerCN=Example
Not Before2024-01-01 00:00:00 UTC
Not After2025-01-01 00:00:00 UTC
Serial Number01
Signature AlgorithmSHA256withRSA
Public Key AlgorithmRSA
Public Key Size~4208 bits
#About SSL Certificate Decoder
Free online SSL certificate decoder. Paste a PEM-encoded certificate to view subject, issuer, validity dates, serial number, and other certificate details. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
#FAQ
What is a PEM certificate? ▾
A PEM (Privacy Enhanced Mail) certificate is a Base64-encoded file format for storing cryptographic certificates. It starts with -----BEGIN CERTIFICATE----- and ends with -----END CERTIFICATE-----. It is the most common format for SSL/TLS certificates.
What information can be extracted from an SSL certificate? ▾
An SSL certificate contains the subject (domain name), issuer (Certificate Authority), validity period (not before/not after dates), serial number, public key information, signature algorithm, and any Subject Alternative Names (SANs).
</> Embed this tool ▾
Copy this code to embed the tool on your website. Adjust the height to fit your layout.
<iframe src="https://www.browserutils.dev/embed/ssl-certificate-decoder" width="100%" height="500" frameborder="0" title="SSL Certificate Decoder"></iframe>