Manual deletion in VCF files often fails because contacts are not stored in a clean table format. Each vCard entry has multiple fields, and duplicates may differ slightly, like extra spaces, different phone formats, or missing email IDs. That makes it difficult to spot repeats just by scrolling or editing.
When the file size grows, checking every contact one by one becomes risky and time-consuming, and you usually skip some duplicates.
A better way is to first try importing contacts into a contacts manager and then use its merge option. For bulk files, a tool like WholeClear vCard Duplicate Remover can scan multiple VCF files together and match duplicate fields automatically, reducing manual effort and missed entries.
