Convert Your CER/CRT Files to PEM

Convert your file’s format (file encoding + extension [e.g., .pem]) in no time using our free client-side tool. Select your file in the file prompt below, and we’ll take care of the rest. (Note: This works for DER- and PEM-encoded .crt files!)

Because everything happens client-side, your certificate files never go beyond your browser.

Use Our Browser-Based Certificate Converter

Certificate File (.crt, .cer, .txt) *⚠️ Upload only leaf or intermediate certificates. Do not include root CA certificates.

OpenSSL/Bash: Convert CER/CRT to PEM

This one-and-done OpenSSL/Bash (Linux/Unix) command switches your CER/CRT certificate files to PEM. It works with DER- and PEM-encoded certificate files alike.

Reminder:Replace the placeholder values with your custom file names + extensions.

OpenSSL/Bash (Linux/Unix) Command:

openssl x509 -in certificate.crt -out certificate.pem -outform PEM

Note: CRT/CER and PEM are often the same format (Base64-encoded).