How to customize PDF.js
PDF.js is a great open-source project which is frequently updated and new features are being added to, however looks-wise it's ugly, or maybe let's say it looks outdated. How about getting the latest PDF features and fixes from PDF.js but having a slick look on the presentation side?
The pdf viewer from PdfJsKit is unobtrusive, it doesn't directly change code of PDF.js, it just includes PDF.js in an iframe and at runtime override HTML, JS and CSS to offer a slick modern look and better ui structure and usability and new features. This way we can always update PDF.js to the latest version easily and get all bug fixes and improvements.
Other pdf viewers based on PDF.js usually don't update the default look, and the ones that does usually miss functionality due to separating into components but partially implementing them or offer a bad/partial API.
Getting started
Install the package to your project:
npm install pdfjskit
When the package is installed (or version is updated), assets (css, images etc.) used by PdfJsKit will be copied automatically from node_modulespdfjskitdistpdfjskit to publicpdfjskit. Your project's public subdirectory is a common place for web assets, but if your JS framework has a different directory structure, you can move assets to another place.
By default PdfJsKit loads assets from pdfjskit subdirectory relative to host page but you can change this path via passing custom libraryPath option to PdfViewer constructor.
Usage
import PdfViewer from "pdfjskit";
var pdfViewer = new PdfViewer({
documentUrl: "pdfjskit/sample.pdf",
width: "80%",
height: 720,
resizable: true,
language: "en-US",
theme: "slate, classic-dark"
});
pdfViewer.render(document.getElementById("container"));
Note that the NPM package contains a ES6 module pdfjskit.min.mjs, also a script version pdfjskit.min.js is provided in GitHub dist/pdfjskit directory and in developer package offered here.
Using PdfJsKit in plain JS projects with Vite
You can use sse any JS framework (React, Vue, Angular, Svelte, Blazor etc) with PdfJsKit, however for simplicity in this post, I will show usage for plain JS projects.
For plain JS projects, I recommend using Vite, this way you can import from module in HTML files easily:
-
Create a Vite project template:
npm create vite@latest
Copy after loginChoose the settings:
✔ Project name: … pdfjskit-vite-example ✔ Select a framework: › Vanilla ✔ Select a variant: › JavaScript
Copy after login -
A subdirectory with your project name will be created, do the following:
cd pdfjskit-vite-example npm install npm install pdfjskit
Copy after login -
Edit index.html and replace contents with:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"> <title>PdfJsKit Vite Example</title> </head> <body> <div id="container"></div> <script type="module"> import PdfViewer from "pdfjskit"; var pdfViewer = new PdfViewer({ documentUrl: "pdfjskit/sample.pdf", width: "80%", height: 720, resizable: true, language: "en-US", theme: "slate, classic-dark" }); pdfViewer.render(document.getElementById("container")); </script> </body> </html>Copy after login -
Now you can run the dev web server:
npm run dev
Copy after loginwhich will show:
➜ Local: http://localhost:5173/ ➜ Network: use --host to expose ➜ press h + enter to show help
Copy after loginClick the Local url with CTRL key to launch the browser.
You will see that PDF Viewer is rendered in the page.
Documentation
- Html API Docs
- Markdown API Docs
- Knowledge Base
Live Demos
- Module Bundle Test
- Script Bundle Test
Links:
- GitHub
- NPM
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