In today’s world, there’s no reason to remember our contacts’ phone numbers or email addresses—that’s a job for our Macs, iPhones, and iPads. This sort of data is so core to using digital devices that Apple has long provided an ecosystem-wide solution in the form of Contacts and syncing through iCloud.

Unfortunately, it’s all too common to end up with multiple cards for the same person in Contacts, either precise duplicates or versions that contain different details. Further muddying the situation, many of us have multiple contact accounts—such as from Google or Microsoft Exchange—and some contacts may be duplicated across several accounts.

This situation is sufficiently common that Apple has provided three ways to deal with duplicate contacts: manually merging selected contact cards, automatically merging duplicate cards, and linking cards replicated in multiple accounts. The first two can be done only in the Contacts app on the Mac; linking can also be accomplished on an iPhone or iPad.

Merge Contact Cards

Let’s say you’ve ended up with two or more contact cards for the same person in the same account. They’ll usually have the same name, but it doesn’t matter if the names are different. To merge them, which combines the data from each into a single card, select them in Contacts, and choose Card > Merge Selected Cards. You should now see just the single merged card.

Contacts generally does a good job of identifying data that’s identical between the cards (like the iPhone numbers above), though different labels can sometimes trip it up. When there’s a conflict, Contacts creates a new entry for it. Name conflicts are added to the note field.

Look for Duplicates

Merge Selected Cards works if you have a small number of duplicates that you can identify easily. However, many people have found themselves in situations where tens or hundreds of contacts have been duplicated, often due to a hiccup in cloud syncing or importing. To help with that too-frequent occurrence, Apple added a feature that looks at all your contact cards and merges those that it determines are duplicates.

It’s simple to use—just choose Card > Look for Duplicates. After Contacts scans all your cards, it puts up a dialog telling you how many cards it found. Click Merge to combine all the duplicates.

Although merging hundreds of cards can be stressful, it usually works very well, and it’s far faster and easier than the alternative, which is to select each set of duplicates manually and use Merge Selected Cards.

Link Contact Cards

The two previous solutions help when you have duplicate contacts in a single account. Equally annoying can be ending up with contact cards for the same person across multiple accounts. (Check to see what accounts are configured and enabled in Contacts > Preferences > Accounts.) At best, those duplicates will simply clutter your contact list; at worst, you might have to check multiple cards to find the right phone number or email address.

Apple helps you clean up your contact list by linking cards for the same contact across different accounts. (You mustn’t link cards for different people; that can result in people receiving texts meant for others and other confusions.) In essence, this works like Merge Selected Cards, but the separate contact cards remain in their accounts, with Contacts displaying just one card with the combined information.

You can also link contacts using the Contacts or Phone apps on an iPhone or iPad, although the steps are much fussier than in Contacts on the Mac:

1. Find a person who is replicated across multiple accounts, and view one of their contact cards.
2. Tap Edit, scroll to the Linked Contacts section at the bottom of the card and tap the green + button.
3. In the contact list that appears, find and tap the second card for the person—it should either be showing or require scrolling up slightly.
4. Tap Link, and in the next screen, tap Done.

If you accidentally link the wrong cards and need to unlink them, edit the linked card and click or tap the red Remove button to break the link.

Changes you make to a combined card are saved to each separate card. However, if you want to edit one of the cards but not the other, you can view and edit each one separately by clicking the account name next to Cards on the Mac or tapping the appropriate card under Linked Contacts on an iPhone or iPad.

Cleaning up your contact list may not be the most exciting thing to do, but it’s worthwhile to eliminate duplicates that could cause confusion later on.

(Featured image by iStock.com/anyaberkut)