Free Backup iPhone Contacts to PC or Mac

MobiKin Assistant for iOS (Free) is a free software to backup iphone data from iphone to computer, including contacts, text messages, photos, video, music, tv shows, podcasts, audiobooks, books, playlists, ringtones, voice memos, camera roll. So you can free backup contacts from iphone to computer.
If you are Mac user, you can download MobiKin Assistant for iOS (Free Mac Version).

This is a guide: How to transfer contacts from iphone to computer