> Markdown version of [Changing Theme On The Fly](https://vaadin.com/docs/v8/framework/articles/ChangingThemeOnTheFly). Section index: [llms.txt](https://vaadin.com/docs/v8/framework/llms.txt)

# <a id="changing-theme-on-the-fly"></a>Changing theme on the fly

Starting from Vaadin 7.3, you can change themes in the application without reloading the page. To do this, simply use the `UI.setTheme(String)` method.

```java
public class ThemeChangeUI extends UI {

  private String[] themes = { "valo", "reindeer", "runo", "chameleon" };

  @Override
  protected void init(VaadinRequest request) {
    ComboBox themePicker = new ComboBox("Theme", Arrays.asList(themes));
    themePicker.setValue(getTheme());

    themePicker.addValueChangeListener(new ValueChangeListener() {
      @Override
      public void valueChange(ValueChangeEvent event) {
        String theme = (String) event.getProperty().getValue();
        setTheme(theme);
      }
    });

    setContent(themePicker);
  }
}
```

In this way, you can let your users choose the look of your application. The functionality also makes it easier to create applications that are branded for different customers.