Tool Categories

Certificate Decoder

Decode SSL/TLS certificates and view all certificate details

Certificate Decoder

Certificate Input
Paste your SSL/TLS certificate (PEM format)

Certificate decoding happens entirely in your browser. No data is sent to any server.

How to Use
  1. Paste your certificate (starts with -----BEGIN CERTIFICATE-----)
  2. Click "Decode Certificate" to parse it
  3. View issuer, subject, validity, key info, and extensions
  4. Click "Use Example Certificate" below to try a sample
Certificate Details
Decoded certificate information

Enter certificate to view decoded information