The safest way to group multiple VCF files into a single contact list is to use a reliable offline tool. Free online tools tend to be unreliable and they may also cause data loss or overwrite already existing data, especially with photo contacts, multiple phone numbers, or custom fields. The Datavare Address Book Converter is a trusted solution that allows you to merge vCard files from different sources while retaining every contact. You can merge vCard contacts quickly and perform a batch merge of VCF contacts without concern. Features such as the detection of duplicates, a preview before you save, and everything is done fully offline to keep your data secure. Therefore, you will have no hesitation merging vCard files into one organized, full contact list.