Convert a CSR from DER to PEM format openssl req -in csr.der -inform DER -out csr.pem -outform PEM. openssl x509 -in certificatename.cer -outform PEM -out certificatename.pem. DER – Distinguished Encoding Rules; this is a binary format commonly used in X.509 certificates. ​While all of this can be a little confusing, thankfully OpenSSL can help you go from one format to another fairly easily. Transforms can take one type of encoded certificate to another. Use our SSL Converter to convert certificates without messing with OpenSSL. For example, you can convert a normal PEM file that would work with Apache to a PFX (PKCS#12) file and use it with Tomcat or IIS. Convert a DER file (.crt .cer .der) to PEM openssl x509 -inform der -in certificate.cer-out certificate.pem; Convert a PEM file to DER Openssl> pkcs12 -help The following are main commands to convert certificate file formats. openssl x509 -inform der -in certificatename.der -out certificatename.pem In the example below I will be converting p7b/cer DER and BASE64 to PEM format – specfically converting the below: You can convert a DER-encoded certificate to PEM format thus: $ openssl x509 -inform der -in filename-out filename.pem They are Base64 encoded ASCII files. Openssl is a command line open source SSL client that is mainly used on Unix systems however there is a version for Windows that is able to convert certificate types. DER stands for Distinguished Encoding Rules, an encoding for ASN.1 data structures; X.509 certificates are represented using the ASN.1 standard. OpenSSL can be used to convert a DER-encoded certificate to an ASCII (Base64) encoded certificate. PEM To DER conversion) PEM to DER openssl x509 -in cert.crt -outform der -out cert.der DER to PEM openssl x509 -in cert.crt -inform der -outform pem -out cert.pem Combination. A PEM file is simply a DER file that's been Base64 encoded. # Convert DER-encoded binary to PEM-encoded P7B openssl pkcs7 -inform der -in signature.cer -out signature.p7b # Convert PEM-encoded P7B to PEM-encoded CRT openssl pkcs7 -print_certs -in signature.p7b -out signature.crt # OR: Convert DER-encoded binary to PEM-encoded CRT openssl pkcs7 -print_certs -inform der -in signature.cer -out signature.crt To convert certificates use OpenSSL. Note: OpenSSL is an open source tool that is not provided or supported by Thawte Some common conversion commands are listed below: Note: The PEM format is the most common format used for certificates. (ie. Converting from DER to PEM: openssl x509 -in -inform PEM -out -outform DER Converting with openssl Converting certificates with openssl is straight forward. Convert PEM to DER Format openssl> x509 -outform der -in certificate.pem -out certificate.der Convert PEM to P7B Format openssl> crl2pkcs7 -nocrl -certfile certificate.cer -out certificate.p7b -certfile CACert.cer Convert PEM to PFX Format OpenSSL conversion steps: openssl x509 -in cert.pem -out cert.der -outform DER (where cert.pem is your server cert and cert.der is your new file name) Internet Explorer conversion steps: 1. Each one takes one of PEM, DER or NET (a dated Netscape format, which you can ignore).. You can change a key from one format to the other with the openssl rsa command (assuming it's an RSA key, of course): Converting DER to PEM – Binary encoding to ASCII. Typically, DER-encoded certificates may have file extension of .DER, .CRT, or .CER, but regardless of the extension, a DER encoded certificate is not readable as plain text (unlike PEM encoded certificate). Get the SHA-1 fingerprint of a certificate or CSR. Entrust Datacard Cloud Services issues Base64 encoded (PEM) server certificates. To convert from one to the other you can use openssl with the -inform and -outform arguments. The openssl command uses PEM encoding by default. The decoder converts the CSR/certificate to DER format before calculating the fingerprint. Converting X.509 to PEM – This is a decision on how you want to encode the certificate (don’t pick DER unless you have a specific reason to). Normally, you can use OpenSSL or Internet Explorer on a Windows system. Extensions used for PEM certificates are cer, crt, and pem. Converting Certificate formats It is possible to convert this two certificate formats using tools like the java keytool or openssl. You can use our CSR and Cert Decoder to get the SHA1 fingerprint of a certificate or CSR. Two certificate formats It is possible to convert certificates without messing with openssl is straight.! 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