Security

PEM to DER Converter

Convert supported PEM certificates, requests and keys into binary DER format.

PEM to DER Converter

Convert supported PEM certificates, requests and keys into binary DER format.

This tool runs in your browser. Your input is processed locally and is not uploaded.

About this Tool

Use this PEM to DER converter to convert certificates, certificate requests and supported public or private keys into binary DER format. The conversion changes only the encoding and does not modify the underlying cryptographic data.

Examples

Convert a PEM certificate to DER
Convert a PEM certificate signing request
Convert a supported PEM public key

Frequently Asked Questions

What is the difference between PEM and DER?

DER is a binary ASN.1 encoding, while PEM wraps DER data in Base64 text with header and footer lines.

Does conversion change the certificate or key?

No. It changes only the representation of the same underlying data.

Can every PEM block be converted?

The tool should support recognized certificate, CSR and key block types and reject unsupported or malformed input.

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