# text.upper_case · Rell standard library · Chromia Docs (concept)

> pure function upper_ case(): text Returns the text obtained by converting all alphabetic characters in this text to upper case. Since 0.9.0

Source: https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/text/upper_case/

FUNCTION

# text.upper\_case

```signature
pure function upper_case(): text
```

Returns the text obtained by converting all alphabetic characters in this text to upper case.

Since 0.9.0

[View this page on docs.chromia.com](https://docs.chromia.com/pages/rell-stdlib/-rell%20-system%20-library/%5Broot%5D/text/upper_case.html)Generated API reference, mirrored from the live docs