---
page_title: lower function reference
description: >-
  The `lower` function converts all uppercase letters in the given string to
  lowercase. 
---

# `lower` Function

`lower` converts all cased letters in the given string to lowercase.

## Examples

```shell-session
> lower("HELLO")
hello
> lower("АЛЛО!")
алло!
```

This function uses Unicode's definition of letters and of upper- and lowercase.

## Related Functions

- [`upper`](/packer/docs/templates/hcl_templates/functions/string/upper) converts letters in a string to _uppercase_.
- [`title`](/packer/docs/templates/hcl_templates/functions/string/title) converts the first letter of each word in a string to uppercase.