How do I merge duplicate contacts without losing useful details?

Treat a duplicate suggestion as a candidate to review, not a decision. Compare the records side by side: full name and spelling, phone numbers, email addresses, organization, address, and any notes or labels you rely on. Look for details that support the same identity, such as the same distinctive email address or a shared phone number. A matching name by itself is weak evidence, especially for common names or family members who share a surname.

Before merging, note any information that appears in only one record. If it matters, copy it somewhere you can refer to while checking the result, or use the address book’s own export or backup option if available. Do not assume every app combines every field or handles conflicting values the same way. The safest rule is: merge only when you are comfortable that both entries describe the same person, and check the resulting contact afterward.

Google Contacts has a “Merge & fix” tool that suggests possible duplicates; it lets you merge selected suggestions or all suggestions, and you can select particular contacts to combine. Review candidates before accepting them rather than treating the suggestions as proof that the records match. Contacts saved in different Google Accounts cannot be merged using this feature. [S1]

A cautious workflow is to open a suggestion, compare the records, and select only the pair you have verified. Avoid choosing “merge all” until you have reviewed the suggestions and are confident each one is appropriate. Afterward, open the combined contact and check that the useful phone numbers, email addresses, and notes are present. The source describes separating merged contacts or undoing changes, but it does not establish that every detail or every kind of contact data will be preserved in every case. [S1]

Keep them separate until you can establish they are the same person. For example, imagine two records named “Jordan Lee”: one has a work address and an office number, while the other has a different email and a note about a neighborhood group. Those differences could indicate separate people, or one person with information collected at different times; the name alone cannot settle it.

You can label the records for your own review or add a neutral note such as “Check whether this is the same Jordan Lee.” If you have a reliable way to confirm identity, do that before merging. Don’t delete one record just because it resembles another: deleting removes an entry instead of combining its details, and it may discard information you wanted to keep. If you cannot resolve the uncertainty, leaving both records in place is a reasonable outcome.

Use this sequence for each suspected pair:

1. Open both records and compare their identifying details, not just their names.
2. Mark what is unique to each one, especially alternate contact details, notes, and labels.
3. If identity is uncertain, stop and keep both records separate.
4. If they clearly match, preserve any important one-off information and use the address book’s supported merge option.
5. Reopen the result and check the combined record. If something is missing, consult that app’s available undo or restore options before making further changes.

Worked example: Record A says “Avery Chen,” lists a personal email, and has a note that they prefer text messages. Record B has the same name and personal email, plus a current work number. If other details confirm it is one person, preserve the text-message note, merge the records with the app’s tool, and verify that the resulting contact includes the email, work number, and note. If the records only share the name, do not merge yet.