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🔒 Certificate Decoder

Decode and analyze SSL/TLS certificates.

All processing happens locally in your browser. No data is sent to any server. GDPR/DORA compliant.

Certificate Reference

Common Fields

  • CN - Common Name
  • O - Organization
  • OU - Organizational Unit
  • C - Country
  • ST - State/Province
  • L - Locality

Key Types

  • RSA (2048, 4096 bits)
  • ECDSA (P-256, P-384)
  • Ed25519

Key Usage

  • Digital Signature
  • Key Encipherment
  • Certificate Signing
  • CRL Signing

Extended Key Usage

  • Server Authentication
  • Client Authentication
  • Code Signing
  • Email Protection