Marketing Cloud Engagement | How to Bulk Delete Contacts in Contact Builder

[Step 1] Enable Contact Deletion

1. Log in to Marketing Cloud. (Ensure you are logged in to the Enterprise account / Top-Level Business Unit.)
2. Access the [Contact Builder] > [Contacts Configuration] tab
3. On the right side of the screen, click [On] for the [Contact Deletion] item
4. A confirmation popup for enabling contact deletion will appear — check the box and click [OK]

[Step 2] Bulk Contact Deletion

1.[Contact Builder] > Data Extensions:
Create a Data Extension containing the list of Contact Keys to be deleted.
*Data with Contact Keys only is sufficient. 
*Make sure to check [Is Sendable] when creating the Data Extension.

2.[Contact Builder] > All Contacts:
Once contact deletion is enabled, a Trash Can icon button will appear in the upper right of the screen. Click this button and select [Delete Contacts from Data Extension].

3.A [Delete Contacts from Data Extension] window will pop up. Select the Data Extension created in step 1 and click [Delete Contacts].
* If you check [Also delete contacts and data extension], the Data Extension created in step 1 will also be deleted. 
*If unchecked, the Data Extension itself will remain, but the contact data will be deleted.

4. Confirm that the contact deletion process schedule is displayed, then click [Delete Contacts].