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What is the difference between a .CRT and a .CER file?

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The file extensions .CRT and .CER are interchangeable.  If your server requires that you use the .CER file extension, you can change the extension by following the steps below:

  • Double-click on the yourwebsite.crt file to open it into the certificate display.
  • Select the Details tab, then select the Copy to file button.
  • Hit Next on the Certificate Wizard.
  • Select Base-64 encoded X.509 (.CER), then Next.
  • Select Browse (to locate a destination) and type in the filename yourwebsite.
  • Hit Save. You now have the file yourwebsite.cer