Lowercase()

Returns the provided string using only lowercase letters.

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

1Lowercase(sourceString)

The Lowercase() function has one parameter:

• sourceString (string): Required. The string that you want to convert to lowercase characters.

To use the function, pass it a string that you want to convert to lowercase characters.

1%%[
2  Var @email, @emailNormalized
3  Set @email = "TOMAS.SANTOS@EXAMPLE.com"
4  Set @emailNormalized = Lowercase(@email)
5]%%
6
7<p>The email address is %%=v(@emailNormalized)=%%.</p>

The example outputs the lowercase string.

1The email address is tomas.santos@example.com.