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Certificate Decoder

Decode SSL certificates from PEM, DER, or base64 format. View certificate details, validity, and issuer information.

🛠️ How to Use
  1. Paste the certificate in PEM format or upload a .crt/.pem/.cer/.der file.
  2. Click Decode Certificate.
  3. Review Subject, Issuer, Validity, Key details and Fingerprints.
  4. Use Download or Copy to save the original certificate.
Example (PEM)
-----BEGIN CERTIFICATE-----
MIIFazCCA1OgAwIBAgIR...
-----END CERTIFICATE-----
Note: For .der/.cer files, we auto-convert to PEM for decoding.