terraform/website/docs/language/functions/upper.mdx

---
page_title: upper - Functions - Configuration Language
description: >-
  The upper function converts all cased letters in the given string to
  uppercase.
---

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> [!IMPORTANT]  
> **Documentation Update:** Product documentation previously located in `/website` has moved to the [`hashicorp/web-unified-docs`](https://github.com/hashicorp/web-unified-docs) repository, where all product documentation is now centralized. Please make contributions directly to `web-unified-docs`, since changes to `/website` in this repository will not appear on developer.hashicorp.com.
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# `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`](/terraform/language/functions/lower) converts letters in a string to _lowercase_.
* [`title`](/terraform/language/functions/title) converts the first letter of each word in a string to uppercase.