To import Gmail contacts to iCloud without creating duplicates, start by cleaning your Gmail contacts first. In Google Contacts, use the Merge & fix option to remove duplicates or combine repeated entries. Then, export your contacts in vCard (.vcf) format and import them into iCloud.com under Contacts. This ensures iCloud receives a clean contact list.

For larger contact lists or multiple Gmail accounts, using a tool like MailConverterTools Gmail Backup Tool can make the process easier. The tool allows you to select Gmail contacts, remove duplicates automatically, and import them into iCloud while keeping all details organized, avoiding repeated entries.