PEM / DER Certificate Converter
Convert X.509 certificates and keys seamlessly between Base64 PEM text format and binary DER format instantly.
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Format Reference
1. PEM Format (.pem, .crt, .cer)
A text-based format enclosed by header/footer boundaries using Base64 encoding. Widely used across Apache, Nginx, and OpenSSL configurations.
2. DER Format (.der, .cer)
A binary format storing ASN.1 encoded certificate elements. Commonly required by Java platforms, Windows environments, and embedded systems.
Frequently Asked Questions (FAQ)
PEM is a printable ASCII Base64 format with boundary headers, while DER is the raw binary representation of the exact same cryptographic object.
Yes. All conversions run entirely inside your browser's local memory runtime without sending certificate data across networks.
Yes, the converter handles any standard PEM or DER encoded blocks including private keys, public keys, and certificate signing requests.