You can create a Customer File custom audience by uploading a list of leads or customers. When you upload a .csv or .txt file to your TikTok Ads Manager, TikTok will search for users on the platform that match the provided IDs. After matching, a custom audience will be created, and your uploaded file will be promptly deleted.

The audience manager page in TikTok Ads Manager displays the size of total matched users. This helps you get a better understanding of the presence of your audiences on TikTok. Only opted-in people can be reached with a TikTok campaign.

• Customer file audiences can be used in campaigns to promote products or services to your existing list of leads or customers.

• You could also optimize ad spend by excluding recent conversions.

• You could also create a lookalike of this audience for prospecting campaigns to find new customers.

You can review the example file to help create a customer file to upload.

Learn more about specifications for a customer file.

You can also download the customer file example template here

Learn how to create a Custom Audience with a customer file.

The Available Audience size estimator on the campaign creation step will display a more realistic reach of the campaign using a custom audience. The Available Audience is based on a number of factors including a person's opt-in status, age and location, among others.

Learn more about audience size estimation.