PDF.js vs PDF.js Express

This page compares two PDF.js viewers to help you choose the best way to embed a PDF viewer in your website or application.

VS

PDF.js

PDF.js is an open source PDF viewer for displaying PDFs in a browser using JavaScript.

PDF.js Express is a PDF.js viewer with out-of-the-box annotation, PDF form fill, and signing.

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Viewing
Max zoom factor (image depth / quality)	1,000%	+100,000%	+100,000%
Crisp graphics at high zoom
Annotations
Collaborate in real-time
Freehand, free text, shape, comment annotations
Stamp document with text, images
Watermark to prevent distribution
User roles and permissions (control access to each annotation)
Annotation events to trigger custom functionality
Create custom annotations
Cloudy annotations
Measurement tools (distance, perimeter, area)
Modern UI
Modern UI written in ReactJS
Fully responsive
Customizable
Dark theme
Hide/Show Download/Print and other tools
Open source UI (source code downloadable)
PDF Forms
User form filling
Merging form data
Programmatically prepopulate forms
Extract forms data and save values separately
JavaScript field validation/formatting
Customize form appearance
Print entered field values
Form actions/interaction between elements
Signatures
Sign by using hand-drawn annotation
Save signatures for signing multiple pages
Search
Wildcard search option
Ambient string, return context to your search
More accurate text search
Support
Rendering engine	PDF.js open-source community	PDF.js open-source community	PDF.js open-source community
PDF Viewer UI	PDF.js open-source community	1-on-1 support via forum	1-on-1 support via forum
Documentation
Guides
Samples
		Try it for free