Foxit PDF Reader vs Mozilla PDF.js

Foxit PDF Reader is a free PDF reader for viewing, annotating, filling and signing PDF documents. It supports standard Acroforms and XFA forms, and its collaboration tools include shared reviews, comments and document feedback. Users can sign by hand, use a saved signature image or connect with DocuSign. The reader integrates with cloud storage services, enterprise content management systems and Microsoft SharePoint; listed business integrations include Microsoft Teams and Salesforce. Security controls include Protected View, Trust Manager, Safe Mode, ASLR and DEP. Foxit lists support for Windows 10 and 11, macOS 10.15 through 14, iOS, Android and the web. Mobile apps are available for smartphones and tablets, and desktop use can work offline. The Free PDF Reader plan costs nothing. Foxit PDF Editor is a separate product with a free 14-day trial. Help options include searchable articles, troubleshooting, ticket submission and regional phone support.

Mozilla PDF.js is a free, web standards-based platform for parsing and rendering PDF files. Developers can use its display API to render documents and retrieve information, or adapt the viewer layer for a custom interface. That viewer is used in Firefox and project browser extensions. PDF.js renders annotations and supports adding a subset of annotation types, and it supports form filling; OCR is not provided. The project targets HTML5-compliant browsers and includes a legacy build for older browsers, although PDF feature support varies by browser and version. Prebuilt builds are available, with hosted copies listed through jsDelivr, cdnjs, and unpkg. Developers can clone and build it locally, but some browsers require a local web server instead of opening PDFs through file URLs. Cross-origin requests are blocked by default, so CORS or a server proxy may be needed. For large documents, rendering only visible pages can reduce memory use. PDF.js is licensed under Apache 2.0.