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sidebar_position: 3
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# Options

## Application Options

The `Options.App` struct contains the application configuration.
It is passed to the `wails.Run()` method:

```go title="Example"
import "github.com/wailsapp/wails/v2/pkg/options"

func main() {

    err := wails.Run(&options.App{
        Title:             "Menus Demo",
        Width:             800,
        Height:            600,
        DisableResize:     false,
        Fullscreen:        false,
        Frameless:         true,
        MinWidth:          400,
        MinHeight:         400,
        MaxWidth:          1280,
        MaxHeight:         1024,
        StartHidden:       false,
        HideWindowOnClose: false,
        RGBA:              &options.RGBA{R: 0, G: 0, B: 0, A: 255},
        Assets:            assets,
        Menu:              app.applicationMenu(),
        Logger:            nil,
        LogLevel:          logger.DEBUG,
        OnStartup:         app.startup,
        OnDomReady:        app.domready,
        OnShutdown:        app.shutdown,
        Bind: []interface{}{
            app,
        },
        Windows: &windows.Options{
            WebviewIsTransparent: false,
            WindowIsTranslucent:  false,
            DisableWindowIcon:    false,
        },
    })
    if err != nil {
        log.Fatal(err)
    }
}

```



### Title

Name: Title

Type: string

The text shown in the window's title bar.

### Width

Name: Width

Type: int

The initial width of the window.
Default: 1024.

### Height

Name: Height

Type: int

The initial height of the window.
Default: 768

### DisableResize

Name: DisableResize

Type: bool

By default, the main window is resizable. Setting this to `true` will keep it a fixed size.

### Fullscreen

Name: Fullscreen

Type: bool

Setting this to `true` will make the window fullscreen at startup.

### Frameless

Name: Frameless

Type: bool

When set to `true`, the window will have no borders or title bar.
Also see [Frameless Windows](/docs/guides/frameless).

### MinWidth

Name: MinWidth

Type: int

This sets the minimum width for the window. If the value given in `Width` is less than this value,
the window will be set to `MinWidth` by default.

### MinHeight

Name: MinHeight

Type: int

This sets the minimum height for the window. If the value given in `Height` is less than this value,
the window will be set to `MinHeight` by default.

### MaxWidth

Name: MaxWidth

Type: int

This sets the maximum width for the window. If the value given in `Width` is more than this value,
the window will be set to `MaxWidth` by default.

### MaxHeight

Name: MaxHeight

Type: int

This sets the maximum height for the window. If the value given in `Height` is more than this value,
the window will be set to `MaxHeight` by default.

### StartHidden

Name: StartHidden

Type: bool

When set to `true`, the application will be hidden until [WindowShow](/docs/reference/runtime/window#WindowShow)
is called.

### HideWindowOnClose

Name: HideWindowOnClose

Type: bool

By default, closing the window will close the application. Setting this to `true` means closing the window will
hide the window instead.

### RGBA

Name: RGBA

Type: int (0xRRGGBBAA)
Example: 0xFF000088 - Red at 50% transparency

This value is the RGBA value to set the window by default.
Default: 0xFFFFFFFF.

### Assets

Name: Assets

Type: \*embed.FS

The frontend assets to be used by the application. Requires an `index.html` file.

### Menu

Name: Menu

Type: \*menu.Menu

The menu to be used by the application. More details about Menus in the [Menu Reference](/docs/reference/runtime/menu).

### Logger

Name: Logger

Type: logger.Logger
Default: Logger to Stdout

The logger to be used by the application. More details about logging in the [Log Reference](/docs/reference/runtime/log).

### LogLevel

Name: LogLevel

Type: logger.LogLevel
Default: `Info` in dev mode, `Error` in production mode

The default log level. More details about logging in the [Log Reference](/docs/reference/runtime/log).

### OnStartup

Name: OnStartup

Type: func(ctx context.Context)

This callback is called after the frontend has been created, but before `index.html` has been loaded. It is given
the application context.

### OnDomReady

Name: OnDomReady

Type: func(ctx context.Context)

This callback is called after the frontend has loaded `index.html` and the DOM is ready. It is given
the application context.

### OnShutdown

Name: OnShutdown

Type: func(ctx context.Context)

This callback is called after the frontend has been destroyed, just before the application terminates. It is given
the application context.

### Bind

Name: Bind

Type: []interface{}

A slice of struct instances defining methods that need to be bound to the frontend.

### Windows

Name: Windows

Type: \*windows.Options

This defines [Windows specific options](#windows-specific-options).

## Windows Specific Options

### WebviewIsTransparent

Name: WebviewIsTransparent

Type: bool

Setting this to `true` will make the webview background transparent when an alpha value of `0` is used.
This means that if you use `rgba(0,0,0,0)`, the host window will show through.
Often combined with [WindowIsTranslucent](#WindowIsTranslucent) to make frosty-looking applications.

### WindowIsTranslucent

Name: WindowIsTranslucent

Type: bool

Setting this to `true` will make the window background translucent. Often combined
with [WebviewIsTransparent](#WebviewIsTransparent) to make frosty-looking applications.

### DisableWindowIcon

Name: DisableWindowIcon

Type: bool

Setting this to true will remove the icon in the top left corner of the title bar.