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---
page_title: upper - Functions - Configuration Language
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
```shell-session
> upper("hello")
HELLO
> upper("алло!")
АЛЛО!
```
This function uses Unicode's definition of letters and of upper- and lowercase.
## Related Functions
- [`lower`](/docs/templates/hcl_templates/functions/string/lower) converts letters in a string to _lowercase_.
- [`title`](/docs/templates/hcl_templates/functions/string/title) converts the first letter of each word in a string to uppercase.