PEM Certificate Inspector
Parse a PEM certificate or private key and inspect its fields
About
Parse a PEM-encoded X.509 certificate or private key and show its fields: subject and issuer DNs, validity window (with expired status), serial number, version, public-key algorithm and size, signature algorithm, and Subject Alternative Names. Everything runs locally in your browser; the PEM is never uploaded.
Related guides
PKI Key Pair Generator: Self-Signed Certs and CSRs in the Browser
Generate RSA/ECDSA keys, self-signed X.509 certificates and PKCS#10 CSRs online with node-forge — for local HTTPS and dev TLS.
Reading a PEM Certificate: Subject, Issuer, SANs and Expiry
What the fields in a PEM certificate mean, why Subject Alternative Names matter more than the Common Name, and how to decode expiry and key usage.
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