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PEM Decoder

Decodes an X.509 certificate, a CSR or a public key in PEM format — shows structured fields (subject, issuer, validity, SAN, fingerprints) and raw details.

PEM block to decode

ℹ Supported: CERTIFICATE, CERTIFICATE REQUEST, PUBLIC KEY, RSA/EC PRIVATE KEY. Multiple consecutive blocks (chain) are accepted.

// Paste the PEM block above, including -----BEGIN ...----- and -----END ...----- lines.

Coverage

  • X.509 — subject, issuer, validity, SAN, extensions
  • CSR — subject and requested public key
  • Public key — RSA / EC / DSA, size, curve
  • Fingerprints — SHA-1 and SHA-256 of the certificate
  • RSA modulus — exponent and modulus in hex
  • multi-blocs — certificate chains supported