Cert Inspector

PEM / DER inspector. Minimal X.509 parser: subject, issuer, validity, public-key info, extensions, fingerprints.

About this tool

Inspect one local X.509 certificate in PEM, Base64, or hexadecimal DER form. The tool reads encoded fields and calculates fingerprints in this browser. It does not verify a signature, certificate chain, hostname, or revocation status.