Sample code for 30+ languages & platforms
C#

Convert Certificate from DER to PEM.

See more Certificates Examples

Loads a digital certificate from any format, such as DER, and saves to PEM format.

Chilkat C# Downloads

C#
bool success = false;

Chilkat.Cert cert = new Chilkat.Cert();

// LoadFromFile will load virtually any certificate format file.
// It will auto-recognize the format and load appropiately.
// In this case, load a DER format certificate and convert to PEM.
success = cert.LoadFromFile("qa_data/certs/testCert.cer");
if (success != true) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

success = cert.ExportCertPemFile("qa_data/certs/testCert.pem");
if (success != true) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

Debug.WriteLine("Converted certificate from DER to PEM format.");