Convert DER to PEM

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

Convert Online (Browser-Based)

Upload DER File (.der, .cer, .key, .crt, .txt) *

Convert Using OpenSSL/Bash (Linux/Unix)

Select the type of DER file you want to convert:

Certificate File (.der → .pem)

Private Key File (.der → .pem)

CSR File (.der → .pem)

Only one file type can be selected at a time.

OpenSSL/Bash (Linux/Unix) Command:

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

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