Prepare your Excel contact sheet
Use one contact per row and clear column headers. Keep full name, phone, email, and optional notes in separate columns.
Phone numbers as Text: Format phone columns as Text in Excel before you save leading zeros (for example 00123456789 or 03001234567). If Excel already stored the value as a number and dropped zeros, this converter cannot recover them.
For structured names, put family and given parts in an N column as Family;Given;;; (semicolons separate name parts). Or map a full-name column to FN and let the tool derive N.
Use .xlsx files through the workbook uploader. For CSV input, use CSV to vCard.