I work in an environment where internet access is limited due to data security policies. I have a large Excel file containing hundreds of contacts (names, phone numbers, email addresses, company details, etc.) that need to be converted into vCard (VCF) format for use on mobile phones and email clients. I have seen many Excel to vCard Converter tools online, but I am confused about which features actually matter when buying a tool for offline use. I want a reliable solution that ensures data safety and accurate conversion without uploading files to the cloud.