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How can I fix duplicate contacts created after syncing contacts from multiple accounts?

I synced contacts from Outlook, iCloud, and my mobile phone, but the final VCF export contains many duplicate records. Some contacts appear twice, while others are repeated several times. Is there an efficient way to fix duplicate contacts before I import the file back into my devices?

This usually happens when contacts are merged from different sources like Outlook, iCloud and phone storage. Each platform saves its own copy, so when you export everything into one VCF file, duplicates show up with slight differences in fields like name format or email spacing.

An easy way of dealing with the situation would be to load the VCF file on any desktop contacts application (like Windows Contacts or Microsoft Outlook) and sort the contacts based on email or phone numbers and then merge duplicate entries or delete them. It works well enough for smaller-sized files, but not for larger files.

In such cases, I’ve seen people using a small Windows-based utility for removing vCard duplicates, such as WholeClear vCard Duplicate Remover, to scan and remove repeated entries in bulk before re-importing the file.

One thing to be careful about is reviewing the matched duplicates once before final cleanup, just to avoid removing similar but different contacts.