terraform/website/docs/configuration/functions/upper.html.md

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---
layout: "functions"
page_title: "upper - Functions - Configuration Language"
sidebar_current: "docs-funcs-string-upper"
description: |-
The upper function converts all cased letters in the given string to uppercase.
---
# `upper` Function
`upper` converts all cased letters in the given string to uppercase.
## Examples
```
> upper("hello")
HELLO
> upper("алло!")
АЛЛО!
```
This function uses Unicode's definition of letters and of upper- and lowercase.
## Related Functions
* [`lower`](./lower.html) converts letters in a string to _lowercase_.
* [`title`](./title.html) converts the first letter of each word in a string to uppercase.