# Core Features

- Human documentation: [https://docs.univer.ai/guides/pdfs/features/core](https://docs.univer.ai/guides/pdfs/features/core)

- Agent Markdown: [https://docs.univer.ai/guides/pdfs/features/core.md](https://docs.univer.ai/guides/pdfs/features/core.md)

- Requested language: `en-US`

- Content language: `en-US`

- Documentation version: `1.0.0-rc.0`

- Source: [pdfs/features/core/index.mdx](https://github.com/dream-num/documentation/blob/dev/content/guides/pdfs/features/core/index.mdx)

---

#### Package metadata

```json
{
  "preset": [],
  "plugins": [
    {
      "client": "@univerjs-pro/pdfs",
      "facade": "@univerjs-pro/pdfs/facade"
    },
    {
      "client": "@univerjs-pro/pdfs-ui",
      "locale": "@univerjs-pro/pdfs-ui/locale/en-US",
      "style": "@univerjs-pro/pdfs-ui/lib/index.css"
    }
  ],
  "server": false
}
```

Univer PDFs core provides a formal PDF unit, a durable edit layer, and a browser workbench. Imported PDF content remains the source baseline, while accepted changes are stored in the unit snapshot and rendered as the current document.

## Features

* **PDF unit model**: Stores the source document, page structure, resources, and durable editing intent in `IPdfUnitData`.
* **Page and element operations**: Supports page navigation and insertion plus editable text, lists, tables, images, dividers, and annotations.
* **Browser workbench**: Renders PDF pages, thumbnails, selection, editing controls, clipboard behavior, and the inspector UI.
* **Command pipeline**: Applies accepted changes through durable commands and mutation batches so save, undo, and redo share one model.
* **Facade API**: Creates, finds, edits, and saves PDF units through application-facing PDF, page, element, and native-text objects.

## Preset Mode

Univer PDFs does not currently export a preset package. Create PDF applications with Plugin Mode.

## Plugin Mode

### Installation

#### npm

```bash
npm install @univerjs/core @univerjs/design @univerjs/ui @univerjs-pro/license @univerjs-pro/pdfs @univerjs-pro/pdfs-ui
```

#### pnpm

```bash
pnpm add @univerjs/core @univerjs/design @univerjs/ui @univerjs-pro/license @univerjs-pro/pdfs @univerjs-pro/pdfs-ui
```

#### yarn

```bash
yarn add @univerjs/core @univerjs/design @univerjs/ui @univerjs-pro/license @univerjs-pro/pdfs @univerjs-pro/pdfs-ui
```

#### bun

```bash
bun add @univerjs/core @univerjs/design @univerjs/ui @univerjs-pro/license @univerjs-pro/pdfs @univerjs-pro/pdfs-ui
```

### Usage

```ts
import { UniverLicensePlugin } from '@univerjs-pro/license'
import { UniverPdfsPlugin } from '@univerjs-pro/pdfs'
import { UniverPdfsUIPlugin } from '@univerjs-pro/pdfs-ui'
import PdfsUIEnUS from '@univerjs-pro/pdfs-ui/locale/en-US'
import { LocaleType, mergeLocales, Univer } from '@univerjs/core'
import { FUniver } from '@univerjs/core/facade'
import DesignEnUS from '@univerjs/design/locale/en-US'
import { UniverUIPlugin } from '@univerjs/ui'
import UIEnUS from '@univerjs/ui/locale/en-US'

import '@univerjs-pro/pdfs/facade'

import '@univerjs/design/lib/index.css'
import '@univerjs/ui/lib/index.css'
import '@univerjs-pro/pdfs-ui/lib/index.css'

const univer = new Univer({
  locale: LocaleType.EN_US,
  locales: {
    [LocaleType.EN_US]: mergeLocales(DesignEnUS, UIEnUS, PdfsUIEnUS),
  },
})

univer.registerPlugin(UniverUIPlugin, { container: 'app' })
univer.registerPlugin(UniverLicensePlugin, {
  license: process.env.CLIENT_LICENSE_TEXT,
})
univer.registerPlugin(UniverPdfsPlugin)
univer.registerPlugin(UniverPdfsUIPlugin)

const univerAPI = FUniver.newAPI(univer)
const pdf = univerAPI.createPdf({ name: 'Untitled PDF' })
```

`UniverPdfsPlugin` owns the PDF unit and durable commands. `UniverPdfsUIPlugin` owns the browser viewer and its editing controls. For viewer-only UI, register `UniverPdfsUIPlugin` with `{ editor: { enabled: false } }`. Collaboration-backed applications can additionally register `@univerjs-pro/pdfs-editor` together with the collaboration plugins it requires.