---
title: "lowercased(with:)"
framework: swift
role: symbol
role_heading: Instance Method
path: "swift/stringprotocol/lowercased(with:)"
---

# lowercased(with:)

Returns a version of the string with all letters converted to lowercase, taking into account the specified locale.

## Declaration

```swift
func lowercased(with locale: Locale?) -> String
```