# to_upper

Converts a string to uppercase.

```tql
to_upper(x:string) -> string
```

## Description

The `to_upper` function converts all characters in `x` to uppercase.

## Examples

### Convert a string to uppercase

```tql
from {x: "hello".to_upper()}
```

```tql
{x: "HELLO"}
```

## See Also

* [`capitalize`](https://preview.docs.tenzir.com/375/375/reference/functions/capitalize.md)
* [`is_upper`](https://preview.docs.tenzir.com/375/375/reference/functions/is_upper.md)
* [`to_lower`](https://preview.docs.tenzir.com/375/375/reference/functions/to_lower.md)
* [`to_title`](https://preview.docs.tenzir.com/375/375/reference/functions/to_title.md)
* [Manipulate strings](https://preview.docs.tenzir.com/375/375/guides/transformation/manipulate-strings.md)