Convert Your PEM Files to CRT/CER

This free tool makes converting PEM-encoded files to .crt/.cer format quick and easy. Because the conversion takes place in the browser, sensitive files are never transmitted to our server.

Convert Online (Browser-Based)

PEM Certificate File (.pem, .txt) *⚠️ Upload only leaf or intermediate certificates. Do not upload root CA certificates.Note: This tool only changes the file extensions; it does not change the file encoding to DER.

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

Convert your PEM-encoded files with .pem extensions to .crt format using the following terminal command. (Replace placeholder values with your actual filenames and input file extension [if different than .pem].)

Optionally, you can include the trust chain certificates and/or change the encoding of the file from PEM (base64/text) to DER (binary).

Include Certificate Chain (CA Bundle)

Output DER (Binary)

OpenSSL/Bash (Linux/Unix) Command:

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

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