How can I remove duplicate contacts from a large VCF file without deleting unique entries?

I received a VCF file with several thousand contacts, but many of them are duplicates. Some duplicates have the same phone number, while others share the same email address. I don't want to remove valid contacts by mistake. What's the safest way to clean duplicate contacts from a large VCF file?

 

The safest way is to back up your original VCF file before making any changes. Then, use a duplicate detection feature that compares contacts based on email addresses, phone numbers, or other unique details instead of just names. Always preview the duplicate list before deleting anything to ensure unique contacts are preserved.