---
title: strings.ToUpper
description: Returns the given string, converting all characters to uppercase.
categories: []
keywords: []
params:
  functions_and_methods:
    aliases: [upper]
    returnType: string
    signatures: [strings.ToUpper INPUT]
aliases: [/functions/upper]
---

```go-html-template
{{ upper "BatMan" }} → BATMAN
```