Security

Certificate Decoder

Paste a PEM-encoded certificate to see its subject, issuer, validity dates, and extensions decoded into readable JSON entirely client-side.

PEM-encoded certificate

Uses a built-in minimal ASN.1 DER parser (not a full X.509 toolkit — covers the fields above, not extensions like SANs or key usage yet). Decoding runs entirely client-side; the certificate never leaves your browser.

Frequently Asked Questions

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