PEM/DER Converter
Convert certificates and keys between PEM and DER encoding.
PEM input
Drop a file here
Drop a .pem or .der/.crt file
Output
About the PEM/DER Converter
Convert between PEM (Base64-armored) and DER (binary) representations of certificates, keys, and other ASN.1 structures. Automatically detects the PEM label, and lets you download the result as a .der or .pem file.
Examples
Convert PEM to DER
-----BEGIN CERTIFICATE-----...Output
30 82 01 22 30 0d ...Related tools
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Frequently asked questions
Version 1.0.0 · Updated 2026-08-10 · Runs entirely in your browser