About guidelines for customer files

Last updated: February 2025

You can upload a Customer File to create a Custom Audience on TikTok Ads Manager. Once uploaded, TikTok will look for users within our ecosystem that match the IDs on the uploaded file. Once matched, a custom audience will be generated and your uploaded file will be promptly deleted.

Guidelines to create a customer file

Some quick guidelines to create a Custom Audience from a Customer File:

  • Ensure the file is in a .csv or .txt format and that each device identifier is on a new line or separated by commas. Make sure your prepared file has a header row for the identifer (Email, Phone or MAID). The file should not be larger than 1 GB.

  • IDFA and GAID can be combined in the same file, but the captilization should be consistent.

  • MD5 and SHA256 encryption is supported. The content of the file before encryption needs to be in all uppercase or lowercase.


Learn more about customer files.