I have an Excel file containing all the business contacts that I need to convert into vCard (vcf) format for importing into my phone. I noticed there are many free online Excel to vCard converters, but they ask to upload contact data to their servers. On the other hand, some tools are paid software that do the conversion offline on a PC. So I want to know which option is better and safer: Paid Excel to vCard Converter or Free Online Tools? Has anyone tried both? Please suggest the best method for secure and accurate conversion.