Convert PEM to DER

Free online tool to convert PEM encoded certificates, keys, and CSRs to DER (binary) format using our browser-based tool or OpenSSL/Bash (Linux/Unix) commands.

Convert Online (Browser-Based)

Upload PEM File (.pem, .crt, .cer, .key, .txt) *

Convert Using OpenSSL/Bash (Linux/Unix)

Select the type of PEM file you want to convert:

Certificate File (.pem → .der)

Private Key File (.pem → .der)

CSR File (.pem → .der)

Only one file type can be selected at a time.

OpenSSL/Bash (Linux/Unix) Command:

openssl x509 -outform DER -in certificate.pem -out certificate.der

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