Convert Your DER Files to PEM

This free online tool quickly changes the encoding and extension of your DER (binary) certificate, key, and CSR files to PEM (base64). Because this SSL/TLS converter runs entirely client-side, nothing leaves your browser or is saved to our server.

Convert Online (Browser-Based)

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

Convert Files to PEM Format Using OpenSSL or Bash (Linux/Unix)

Convert your DER encoding and/or file extension (.der) to PEM (.pem) using the following terminal command. (Replace placeholder values with your actual filenames and input file extensions [if different than .der/.pem].)

Select the type of DER file you want to convert (only one file type can be selected at a time):

Certificate File

Private Key File

CSR File

OpenSSL/Bash (Linux/Unix) Command:

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