In iOS or macOS Contacts App, I would like to duplicate a contact. What is the easyest way to do this?

VCF files are just text files, so you can edit them in every text editor.

  • Right-click on VCF file
  • Select "Open with" and then "Textedit.app"
  • Change whatever field you want to change (N and FN are typical fields to change if you want to change the name)
  • Use "Save as" to save with a new file name

PS: See https://en.wikipedia.org/wiki/VCard#Properties for details about the different fields. Not all of them may be supported by Contacts though.