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The Leading Document & PDF Annotation Library

Let your users annotate and collaborate around PDF, Word, Excel, PowerPoint, and 30+ formats in your web, mobile, server, and desktop applications






Standard & Custom Annotation Types

Built-in support for 26 standard PDF annotation types. For example, users can take notes, make comments, highlight, add shapes, apply freehand ink drawings. Or create your own custom annotations.

ISO Compliant Annotation Interchange

Preserve the original document by keeping dynamic annotations & discussions in an external XFDF file — a standards-compliant format for annotation interchange.

Real-time Collaboration Support

Let users annotate & exchange messages in real-time across devices and platforms. Create security rules to limit who can view, edit, or comment on annotations.

Annotation Workflows

Support countless use cases by dynamically generating the XFDF file from a database. Track changes in an audit trail. Merge or separate annotations. Add approval logic. Support offline annotation. And more.

Accurate Annotation Rendering

Ensure a trustworthy representation of annotations across all devices and browsers with built-in support for 'Appearance Streams'.

Drop-In UIs with Source Code Control

Embed slick & ready-to-use annotation tools & widgets. Or, create unique annotation experiences with the power & flexibility of complete source code customization. No limits!

Powered by the PDFTron SDK

Easy to Integrate

Code samples, familiar package managers, and a Docker image make it easy to get up and running.

Consistent and Predictable

Our core document engine has been perfected by 20 years of knowledge, innovation, and real-world testing.

Fully Customizable

An open source UI gives you complete freedom to match your look & feel, and optimize the user experience.

Truly Cross-Platform

A single API with consistent function calls across platforms means a shorter learning curve and easier maintenance.

Try our SDK for free today

Upcoming Webinar: Live tech update & run-through: Redaction | March 31st at 11 am PT


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