Dev / Crypto

PEM Decoder.

Paste a PEM file — the base64 between BEGIN/END lines. This tool decodes each block and shows metadata without sending anything to a server.

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What PEM is

Privacy-Enhanced Mail format wraps DER bytes in base64 with header/footer lines. TLS certs, CSRs, and SSH keys all use it. For full ASN.1 field parsing, use openssl x509 -text locally.

Further reading: JWT decoded: PEM and the three parts.

JWT DecoderHashBase64