React PDF Kit Setup

react-pdf-kit-setup

Use this skill when: the developer asks to add a PDF viewer using @react-pdf-kit/viewer to a React project, AND the project is not specifically Next.js or Vite. For those, prefer the framework-specific skills.

@react-pdf-kit/viewer builds on PDF.js and renders PDFs through a nested provider chain. Treat the chain as the canonical composition model. Everything else (theming, layout, hooks) layers onto it.

Gotchas

• Install only @react-pdf-kit/viewer. Do NOT install pdfjs-dist separately. In v2, pdfjs-dist is an auto-installed peer dependency pinned to a default version (5.4.530). You install pdfjs-dist yourself ONLY when deliberately overriding that version, which is covered by react-pdf-kit-worker-config.
• RPConfig configures the PDF.js worker for you. The worker is set up automatically. Do NOT set GlobalWorkerOptions.workerSrc or pass a workerUrl. Custom worker URLs are only needed when overriding pdfjs-dist; see react-pdf-kit-worker-config.
• RPConfig belongs at the root and should be rendered once. It also wraps theming internally, so a separate RPTheme is optional.
• licenseKey on RPConfig is optional. Without it the viewer runs in free/trial mode (a watermark is shown). Pass <RPConfig licenseKey="..."> for licensed/commercial use.
• CSS is auto-injected by the library. Do NOT import a separate stylesheet.
• RPDefaultLayout is deprecated in v2. Use RPLayout for every new integration.

Procedure

1. Install the library

pnpm add @react-pdf-kit/viewer

(Use npm install, yarn add, or bun add if not on pnpm.) Nothing else is required; pdfjs-dist is pulled in automatically.

2. Add RPConfig at the app root

RPConfig must be rendered once at the root of your application. It handles worker setup and theming for every viewer instance below it.

// src/App.tsx
import { RPConfig } from '@react-pdf-kit/viewer'
import { PdfViewer } from './PdfViewer'

export function App() {
  return (
    <RPConfig>
      <main style={{ height: '100vh' }}>
        <PdfViewer src="/sample.pdf" />
      </main>
    </RPConfig>
  )
}

For explicit theme control, pass customVariables / customDarkVariables to RPConfig (or nest an RPTheme).

3. Render the viewer with the provider chain

// src/PdfViewer.tsx
import {
  RPProvider,
  RPLayout,
  RPPages,
} from '@react-pdf-kit/viewer'

export function PdfViewer({ src }: { src: string }) {
  return (
    <RPProvider src={src}>
      <RPLayout toolbar>
        <RPPages />
      </RPLayout>
    </RPProvider>
  )
}

RPLayout's toolbar prop renders the default toolbar. The viewer adapts to its container, so give the parent a definite height (100vh or fixed) for virtual scrolling to work. You can also size it directly via RPLayout's style prop.

Verify

pnpm install
pnpm build
pnpm dev

Open the dev server URL. The first PDF page should render with the default toolbar visible. Scroll down. Additional pages mount as you scroll (virtualization at work). Selecting text should produce a real text selection, not a canvas-only image.

References

• Library README: https://github.com/react-pdf-kit/viewer
• Companion skills:
  • react-pdf-kit-nextjs-app-router for Next.js App Router projects.
  • react-pdf-kit-vite for Vite projects.
  • react-pdf-kit-worker-config for overriding the pdfjs-dist version and configuring a custom worker URL.