Using iCloud's online interface to import a CSV file into iCloud Contacts is not directly supported. This can be done, though, by using a workaround that entails importing the CSV file into a macOS Contacts application before linking it with iCloud.
If you are unable to utilize a Mac, you can import CSV files straight into iCloud Contacts using third-party tools and programs. For example, the
GainTools Address Book Manager Program can
import CSV files into a format that iCloud can use. You can import the updated vCard into iCloud Contacts. This enables the preservation of all original data throughout the conversion process. Because of its user-friendly design, users of all skill levels can easily utilize the program. The scanning methods used by the application can quickly scan any type of data, including home addresses, email addresses, and phone numbers. Users have complete control by being able to change, select, and convert both single and big CSV files to VCF format with only a few clicks. Many of the most recent Windows versions, such as Windows 11, 10, 8, 8.1, 7, Vista, XP, and others, are compatible with the software. You can install the free demo version of the application to test its features.