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PDF Reader in JavaScript
JavaScript CSS
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PDF.js is Portable Document Format (PDF) viewer that is built with HTML5.

PDF.js is community-driven and supported by Mozilla Labs. Our goal is to create a general-purpose, web standards-based platform for parsing and rendering PDFs.


PDF.js is an open source project and always looking for more contributors. To get involved checkout:

For further questions or guidance feel free to stop by #pdfjs on

Getting Started

Online demo

Browser Extensions


PDF.js is built into version 19+ of Firefox, however two extensions are still available that are updated at a different rate:

  • Development Version - This version is updated every time new code is merged into the PDF.js codebase. This should be quite stable but still might break from time to time.
  • Stable Version - After version 24 of Firefox is released we no longer plan to support the stable extension. The stable version will then be considered whatever is built into Firefox.

Chrome and Opera

The Chromium extension is still somewhat experimental but it can be installed two ways:

  • Unofficial Version - This extension is maintained by a PDF.js contributor.
  • Build Your Own - Get the code as explained below and issue node make chromium. Then open Chrome, go to Tools > Extension and load the (unpackaged) extension from the directory build/chromium.

The version of the extension for the Opera browser can be found at the Opera add-ons catalog.

Getting the Code

To get a local copy of the current code, clone it using git:

$ git clone git:// pdfjs
$ cd pdfjs

Next, you need to start a local web server as some browsers don't allow opening PDF files for a file:// url:

$ node make server

You can install Node via nvm or the official package. If everything worked out, you can now serve

  • http://localhost:8888/web/viewer.html

You can also view all the test pdf files on the right side serving

  • http://localhost:8888/test/pdfs/?frame

Building PDF.js

In order to bundle all src/ files into two productions scripts and build the generic viewer, issue:

$ node make generic

This will generate pdf.js and pdf.worker.js in the build/generic/build/ directory. Both scripts are needed but only pdf.js needs to be included since pdf.worker.js will be loaded by pdf.js. If you want to support more browsers than Firefox you'll also need to include compatibility.js from build/generic/web/. The PDF.js files are large and should be minified for production.


You can play with the PDF.js API directly from your browser through the live demos below:

The repo contains a hello world example that you can run locally:

For an introduction to the PDF.js code, check out the presentation by our contributor Julian Viereck:

You can read more about PDF.js here:

Even more learning resources can be found at:


Talk to us on IRC:

  • #pdfjs on

Join our mailing list:

Subscribe either using or Google Groups:

Follow us on twitter: @pdfjs

Weekly Public Meetings

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