How to Build a React.js Excel (XLS/XLSX) Viewer

In this blog post, learn how to build a React Excel viewer using the PSPDFKit for Web SDK. You’ll open and view XLS and XLSX files directly in your web browser using client-side processing (no server required).

The image below shows what you’ll be building.

You can check out the demo to see it in action.

Opening and Rendering Office Documents in the Browser

PSPDFKit for Web brings support for Word, Excel, and PowerPoint formats to your application, without you or your users needing any MS Office software, MS Office licenses, or third-party open source software. The technology works by converting an Office document to PDF directly in the browser, and the document is then rendered in our JavaScript viewer.

Unlocking More Capabilities with Office-to-PDF Conversion

​​By converting an Office document to PDF using client-side JavaScript, you have the option to support a rich array of additional Office document functionality, such as:

• Text editing — Edit text directly in the displayed Office document.

• Page manipulation — Organize documents by adding, removing, or rearranging pages.

• Annotations — Boost collaboration by adding text highlights, comments, or stamps.

• Adding signatures — Draw, type, or upload a signature directly to an Office document.

Explore Demo

Requirements to Get Started

To get started, you’ll need:

• The latest version of Node.js.

• A package manager compatible with npm. This post contains usage examples for Yarn and the npm client (installed with Node.js by default).

Creating a New React Project

1. Create a new React app using the Create React App tool:

yarn create react-app pspdfkit-react-example

npx create-react-app pspdfkit-react-example

2. Change to the created project directory:

cd pspdfkit-react-example

Adding PSPDFKit to Your Project

1. Add the PSPDFKit dependency:

yarn add pspdfkit

npm install pspdfkit

2. Copy the PSPDFKit for Web library assets to the public directory:

cp -R ./node_modules/pspdfkit/dist/pspdfkit-lib public/pspdfkit-lib

The code above will copy the pspdfkit-lib directory from within node_modules/ into the public/ directory to make it available to the SDK at runtime.

3. Make sure your public directory contains a pspdfkit-lib directory with the PSPDFKit library assets.

Displaying an Excel Document

1. Add an Excel (XLS, XLSX) document you want to display to the public directory. You can use our demo document as an example.

2. Add a component wrapper for the PSPDFKit library and save it as components/PdfViewerComponent.js:

import { useEffect, useRef } from 'react';

export default function PdfViewerComponent(props) {
	const containerRef = useRef(null);

	useEffect(() => {
		const container = containerRef.current;
		let instance, PSPDFKit;
		(async function () {
			PSPDFKit = await import('pspdfkit');
			PSPDFKit.unload(container);

			instance = await PSPDFKit.load({
				// Container where PSPDFKit should be mounted.
				container,
				// The document to open.
				document: props.document,
				// Use the public directory URL as a base URL. PSPDFKit will download its library assets from here.
				baseUrl: `${window.location.protocol}//${window.location.host}/${process.env.PUBLIC_URL}`,
			});
		})();

		return () => PSPDFKit && PSPDFKit.unload(container);
	}, []);

	return (
		<div
			ref={containerRef}
			style={{ width: '100%', height: '100vh' }}
		/>
	);
}

3. Include the newly created component in App.js:

// src/App.js
import PdfViewerComponent from './components/PdfViewerComponent';

function App() {
	return (
		<div className="App">
			<div className="PDF-viewer">
				<PdfViewerComponent document={'chart.xlsx'} />
			</div>
		</div>
	);
}

export default App;

4. Your project structure will now look like this:

pspdfkit-react-example
├── public
│   ├── pspdfkit-lib
│   └── chart.xlsx
├── src
│   ├── components
│   |   └── PdfViewerComponent.js
|   └── App.js
├── package.json
└── yarn.lock

5. Start the app and run it in your default browser:

yarn start

npm start

A Note about Fonts

In client-side web applications for Microsoft Office-to-PDF conversion, PSPDFKit addresses font licensing constraints through font substitutions, typically replacing unavailable fonts with their equivalents — like Arial with Noto. For precise font matching, you can provide your own fonts, embed them into source files, or designate paths to your .ttf fonts for custom solutions.

Adding Even More Capabilities

Once you’ve deployed your viewer, you can start customizing it to meet your specific requirements or easily add more capabilities. To help you get started, here are some of our most popular React.js guides:

• Instant synchronization
• Document assembly
• Page manipulation
• Editor
• Forms
• Signatures
• Redaction
• Document security

Conclusion

In this blog post, you learned how to build an Excel viewer using React.js with the PSPDFKit SDK.

If you’re looking for a way to render Office documents in your web application, then PSPDFKit for Web Standalone is a great option. It’s a powerful and flexible library that can help you provide your users with a seamless and enjoyable experience.

To get started, you can either:

• Start your free trial to test out the library and see how it works in your application.

• Launch our demo to see the viewer in action.

Author

Hulya Karakaya Technical Writer

Hulya is a frontend web developer and technical writer at PSPDFKit who enjoys creating responsive, scalable, and maintainable web experiences. She’s passionate about open source, web accessibility, cybersecurity privacy, and blockchain.