DevToolsHub

PEM / Certificate Decoder

Decode SSL and X.509 certificates in PEM format. View subject, issuer, validity dates, serial number, and Subject Alternative Names.

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How to use

  1. Paste your PEM certificate (including -----BEGIN CERTIFICATE----- and -----END CERTIFICATE-----) into the box above.
  2. The decoder shows Subject, Issuer, Valid from, Valid to, Serial number, Signature algorithm, and Subject Alternative Names (if present).
  3. Use Share URL to copy a link that includes your PEM (encoded in the query string) so you can share or reopen later.
  4. Use Copy all to copy the decoded fields as text.