If you want to convert CSV contacts to vCard format on Windows without losing any data, the best approach is to use a dedicated offline conversion tool instead of manual methods. WholeClear CSV to vCard Converter is built specifically for this purpose and works smoothly on Windows systems. It allows you to convert CSV files containing names, phone numbers, email addresses, and other contact fields into standard VCF format with proper field mapping. The software runs completely offline, so your contact data stays secure on your computer. It does not require Outlook or any third-party application to be installed. You can convert single or multiple CSV files in bulk, which saves a lot of time when managing large contact lists. Another advantage is that it preserves original contact information and structure during the CSV to vCard conversion process. A free demo version is also available to test the accuracy before purchasing the full license.