# Lowercase()

Returns the provided string using only lowercase letters.

## Availability

<table>
  <tr>
    <td>Marketing Cloud Engagement</td>
    <td>✅ Yes</td>
  </tr>
  <tr>
    <td>Marketing Cloud Next</td>
    <td>✅ Yes</td>
  </tr>
</table>

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

## Syntax

```
Lowercase(sourceString)
```

The `Lowercase()` function has one parameter:

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

## Usage

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

```
%%[
  Var @email, @emailNormalized
  Set @email = "TOMAS.SANTOS@EXAMPLE.com"
  Set @emailNormalized = Lowercase(@email)
]%%

<p>The email address is %%=v(@emailNormalized)=%%.</p>
```

The example outputs the lowercase string.

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