Checkers

SSL Certificate Decoder

Decode and inspect PEM-encoded SSL/TLS certificates. View subject, issuer, validity dates, and Subject Alternative Names.

About This Tool

Parse and decode PEM-encoded X.509 SSL/TLS certificates to view their details including subject, issuer, validity period, and extensions.

How to Use

  1. Paste a PEM-encoded certificate (starts with —–BEGIN CERTIFICATE—–)
  2. Click Decode to parse the certificate
  3. View the decoded fields and details

FAQ

Where do I get the PEM certificate?

You can export it from your browser, download from your server, or get it using: openssl s_client -connect example.com:443