How can duplicates be avoided when converting large business CSV contact lists to VCF?

Duplicates usually appear when CSV files contain repeated entries or when contacts are merged from multiple sources. So the best way to avoid this, first clean the CSV file by sorting contacts using unique fields such as email address or phone number. You can use an expert and trusted CSV to VCF exporter tool that works offline, because an offline contact conversion tool safely transfers a CSV contact list into .vcf format. You can use this offline professional WholeClear CSV to VCF Converter, which comes with preview and field-mapping options that help to verify contacts before final conversion, preventing repeated vCard entries in large business contact lists. This tool makes your contact file compatible with all Android devices and other vCard-supported platforms. You can try its free demo edition by downloading the tool.