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List of supported IDs and formats for a customer file

Last updated: August 2025

Use this list of supported IDs and formats when creating a Custom Audience with a Customer File.

Learn more about Customer File audiences.

ID

Accepted Formats

Required header description

ID formatting requirements

Mobile Advertiser IDs (MAIDs):- Apple IDFA -GAID

Original value, MD5 Hashed, or SHA256 Hashed

MAID or MAID_MD5 or MAID_SHA256

- All characters must be uppercase or lowercase - Character capitalization must be consistent

Phone

Original value or SHA256 Hashed

Phone or Phone_SHA256

- Remove symbols, including "+" sign

- Remove letters

- Remove leading zeros

- Add country code if missing, even in the US


The US phone number (657)777-0000 is normalized to "16577770000". The international phone number 374-93-828222 is normalized to "37493828222"

Email

Original value or SHA256 Hashed

Email or Email_SHA256

- Lowercase only- ID should start with numbers or letters- Example:

firstname-lastname@gmail.com

- Remove '+' and any characters following the '+' symbol until '@'.

Note:

  • Your file will be hashed automatically if there are original values or values that are not hashed.

  • Before hashing, the contents of your file need to contain consistent capitalization.

  • Apple's Identifier For Advertising (IDFA) or Google Advertising ID (GAID) can be combined in the same file, with each entry on a separate line.

  • Each header can appear a maximum of 3 times in one file for a file with multiple IDs.


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