PDF.js

PDF.js was originally created as an extension for Firefox and is included in Firefox since 2012 (version 15), and enabled by default since 2013 (version 19). It was added to Firefox for Android in 2023 (version 111). The project was created to provide a way for viewing PDF documents natively in the web browser, which prevents potential security risks when opening PDF documents outside a browser, as the code for displaying the document is sandboxed in a browser. Its implementation uses the Canvas element from HTML5, which allows for fast rendering speeds. PDF.js is also used in Thunderbird, ownCloud, Nextcloud, and is available as a browser extension for Google Chrome/Chromium, Pale Moon and SeaMonkey. It can be integrated or embedded in a web or native application to enable PDF rendering and viewing, and allows advanced usages such as Server-side rendering. Many web applications, including Dropbox, Slack, and LinkedIn Learning integrate PDF.js to enable previewing PDF documents. According to a benchmark by Mozilla, PDF.js is performant for viewing most common PDF files, while it may have some issues with large or 'graphics-heavy' documents.