How To Bulk Transfer Contacts From One iCloud Account To Another

  Apple makes transferring contacts in bulk from one iCloud account to another somewhat painless on the web.

 Log into the first iCloud account on the web.

 Go to Contact app.

 Select all contacts you want to export.

 Click on the Share button, and select "Export vCard.

Even though it says "Export vCard" singular, it will export multiple contacts in a single ".vcf" file.

 Name and save the .vcf file somewhere safe.

 Log out the first iCloud account.

 Log into the second iCloud account.

 Go to Contact app.

 Click on the + button.

Even though it says "Import Contact" singular, it will import multiple contacts from a single ".vcf" file.

 Select the ".vcf" file to import.

 Wait for a while, if you have a lot of contacts the process can take several minutes and there is no progress indicator whatsoever, it looks like nothing is happening. I wish Apple would add some kind of progress bar with a percentage of completion or something!

 After some time the contact list gets populated.

 Done!

 Delete the ".vcf" file if you so desire, or keep it somewhere safe as a backup.