SSL Certificates

Trusted CA Signed SSL:

Conversion :

Convert a Certificate to PEM: CRT to PEM, CER to PEM, DER to PEM

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X.509 digital certificates are files that are used to affirm the identity of an organization and to protect data integrity. They’re a variety of digitally encoded and/or signed documents that include code signing certificates, SSL/TLS certificates, personal authentication and S/MIME certificates, etc.

Need to convert a certificate to PEM? No problem. We’ll walk you through the process in OpenSSL.
Typically, x.509 certificates can have a variety of file extension types that you can convert certificates and keys to, including:

• Certificate (.CRT) or (.CER)
• Distinguished encoding rules (.DER)
• Privacy-enhanced electronic mail (.PEM)

There are different reasons why you may want to convert them to other formats, such as your server not approving of the existing file format or the file not being compatible with software. But regardless of why you may want to convert your certificate to PEM — if you want to convert these files easily, you can do so by using OpenSSL. There are a few simple OpenSSL commands that will correctly change the file format easily.

How to Convert Your Certificates and Keys to PEM Using OpenSSL

There are four basic ways to manipulate certificates — you can view, transform, combine, or extract them. To transform one type of encoded certificate to another — such as converting CRT to PEM, CER to PEM, and DER to PEM — you’ll want to use the following commands:

OpenSSL: Convert CRT to PEM:

Type the following code into your OpenSSL client:
openssl x509 -in cert.crt -out cert.pem

OpenSSL: Convert CER to PEM

openssl x509 -in cert.cer -out cert.pem

OpenSSL: Convert DER to PEM

openssl x509 -in cert.der -out cert.pem
You can also use similar commands to convert PEM files to these different types of files as well. Furthermore, there are additional parameters you can specify in your command — such as -inform and -outform — but the above examples are the basic, bare bones OpenSSL commands.
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Types of Certificates and Private Keys available

• PEM/CRT/CER/KEY: The PEM format is the most common format of certificates issued by CAs. PEM certificates usually have extensions such as .pem, .crt, .cer, and .key. They are Base64 encoded ASCII files and contain "-----BEGIN CERTIFICATE-----" and "-----END CERTIFICATE-----" statements. Server certificates, intermediate certificates, and private keys are issued in the PEM format. inSync and other similar servers also use PEM format certificates.
• P7B: The PKCS#7 or P7B format is usually stored in Base64 ASCII format and has a file extension of .p7b or .p7c. P7B certificates contain "-----BEGIN PKCS7-----" and "-----END PKCS7-----" statements. A P7B file only contains certificates and chain certificates and not the private key.
• PFX: The PKCS#12 or PFX format is a binary format for storing the server certificate, any intermediate certificates, and the private key in one encrypted file. PFX files usually have extensions such as .pfx and .p12. They are typically used on Windows machines to import and export certificates and private keys.