You can transfer your all contacts from Apple Address Book to Gmail. First we will export contacts from Apple Address Book in VCard format and then import VCards into Gmail. Lets see how to transfer Apple Address Book to Gmail in the following step by step guide.
How to Transfer Address Book to Gmail
Click on “Address Book” icon to open it.
Click on “File” > “Export” > “Export Group vCard…” option.
Type a file name, choose location and click “Save” button to save the vCards file.
This vCards file contains all the Address Book contacts.
Now log on to your Gmail account to import Apple Address Book contacts.
Click on “Contacts”, Click “More actions” menu and select “Import…” option as shown below in screenshot.
Click “Choose File” button to choose vCard file that we have exported from Apple Address Book in step-2
Choose vCards file and click “Open” button.
Now click “Import” button to start importing contacts in Gmail.
Finally you will see the a message like that.