Underline

---
title: Underline
docs:
  - route: /docs/components/mark-toolbar-button
    title: Mark Toolbar Button
---

<ComponentPreview name="basic-marks-demo" />

<PackageInfo>

## Features

- Apply underline formatting to text
- Keyboard shortcut support for quick formatting (`Cmd + U`)
- Renders as `<u>` HTML element by default

</PackageInfo>

## Kit Usage

<Steps>

### Installation

The fastest way to add the underline plugin is with the `BasicMarksKit`, which includes pre-configured `UnderlinePlugin` along with other basic marks and their [Plate UI](/docs/installation/plate-ui) components.

<ComponentSource name="basic-marks-kit" />

### Add Kit

Add the kit to your plugins:

```tsx
import { createPlateEditor } from 'platejs/react';
import { BasicMarksKit } from '@/components/editor/plugins/basic-marks-kit';

const editor = createPlateEditor({
  plugins: [
    // ...otherPlugins,
    ...BasicMarksKit,
  ],
});
```

</Steps>

## Manual Usage

<Steps>

### Installation

```bash
npm install @platejs/basic-nodes
```

### Add Plugin

Include `UnderlinePlugin` in your Plate plugins array when creating the editor.

```tsx
import { UnderlinePlugin } from '@platejs/basic-nodes/react';
import { createPlateEditor } from 'platejs/react';

const editor = createPlateEditor({
  plugins: [
    // ...otherPlugins,
    UnderlinePlugin,
  ],
});
```

### Configure Plugin

You can configure the `UnderlinePlugin` with custom keyboard shortcuts.

```tsx
import { UnderlinePlugin } from '@platejs/basic-nodes/react';
import { createPlateEditor } from 'platejs/react';

const editor = createPlateEditor({
  plugins: [
    // ...otherPlugins,
    UnderlinePlugin.configure({
      shortcuts: { toggle: 'mod+u' },
    }),
  ],
});
```

- `shortcuts.toggle`: Defines a keyboard [shortcut](/docs/plugin-shortcuts) to toggle underline formatting.

### Add Toolbar Button

You can add [`MarkToolbarButton`](/docs/components/mark-toolbar-button) to your [Toolbar](/docs/toolbar) to toggle underline formatting.

</Steps>

## Plugins

### `UnderlinePlugin`

Plugin for underline text formatting. Renders as `<u>` HTML element by default.

## Transforms

### `tf.underline.toggle`

Toggles the underline formatting for the selected text.

Default Shortcut: `Cmd + U`