Uppercase()

Returns the provided string using only uppercase letters.

This function became available in Marketing Cloud Next during the Summer ’26 release (API version 67.0).

1Uppercase(sourceString)

The Uppercase() function has one parameter:

• sourceString (string): Required. The string to convert to uppercase.

To use the function, pass it a string.

1%%[
2  Var @externalCustomerId
3  Set @externalCustomerId = "23df2d94c58ab"
4]%%
5<p>Your customer ID is %%=Uppercase(@externalCustomerId)=%%</p>

The example returns the string in all capital letters.

1Your customer ID is 23DF2D94C58AB