# FAQ

Answers to common questions about licensing, capabilities, frameworks and troubleshooting.

## Licensing

### Is it free for commercial use?

Yes. React PDF Viewer is released under the [MIT License](https://github.com/kiralygyula92/react-pdf-viewer/blob/main/LICENSE): you can use it in commercial and personal projects without a fee. PDF.js, which it uses, is Apache-2.0 licensed; the package's `NOTICE` file lists third-party attributions.

### Do I need to credit the project?

Keep the copyright and license notice when you redistribute the package's code, as the MIT License requires. No credit in your app's UI is needed.

## Capabilities

### Can users edit, annotate, sign or fill in forms?

No. The viewer displays documents. Links are interactive; form fields and other annotations are not. See [Links](https://react-pdf-viewer-chi.vercel.app/react-pdf-viewer/links/).

### Can it show several pages at once?

`layout="continuous"` scrolls through all pages. For spreads or custom layouts, use the [headless](https://react-pdf-viewer-chi.vercel.app/react-pdf-viewer/headless/) building blocks.

### Does it work on phones?

Yes. Below 960px the viewer switches to a compact layout, and the toolbar collapses actions into a **More actions** menu when space runs out. See [Toolbar](https://react-pdf-viewer-chi.vercel.app/react-pdf-viewer/toolbar/).

### Does it work with React Native?

No. It renders with the DOM and canvas APIs of web browsers.

## Frameworks and setup

### Does it work with server rendering?

Yes. The entry points start with `'use client'` and touch no browser globals at import time; the server renders the loading state. See [Next.js](https://react-pdf-viewer-chi.vercel.app/react-pdf-viewer/integrations/nextjs/).

### Why does the console mention a CDN?

Without configuration the PDF.js worker and assets load from jsDelivr, pinned to your installed version. Self-host them for production; see [PDF.js configuration](https://react-pdf-viewer-chi.vercel.app/react-pdf-viewer/pdfjs-configuration/).

## Troubleshooting

### My PDF from another domain doesn't load.

The server must send CORS headers for your origin. See [Authenticated requests](https://react-pdf-viewer-chi.vercel.app/react-pdf-viewer/authenticated-requests/#cross-origin-documents).

### The document reloads on every render.

A binary source (`Blob`, `File`, `ArrayBuffer`) is being created during render. Keep it in state; see [Document sources](https://react-pdf-viewer-chi.vercel.app/react-pdf-viewer/document-sources/).

### My labels don't update or re-render constantly.

Define the `labels` object at module scope or memoise it; see [Labels and locale](https://react-pdf-viewer-chi.vercel.app/react-pdf-viewer/labels/).

## Related

- [Support](https://react-pdf-viewer-chi.vercel.app/react-pdf-viewer/getting-started/support/)
- [Requirements](https://react-pdf-viewer-chi.vercel.app/react-pdf-viewer/getting-started/requirements/)
- [Best practices](https://react-pdf-viewer-chi.vercel.app/react-pdf-viewer/guides/best-practices/)