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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.
Notes
Highlight
Ink
Signature
Bookmarks
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!
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PDFTron SDK
Easy to Integrate
Easy to Integrate
Code samples, familiar package managers, and a Docker image make it easy to get up and running.
Consistent and Predictable
Consistent and Predictable
Our core document engine has been perfected by 20 years of knowledge, innovation, and real-world testing.
Fully Customizable
Fully Customizable
An open source UI gives you complete freedom to match your look & feel, and optimize the user experience.
Truly Cross-Platform
Truly Cross-Platform
A single API with consistent function calls across platforms means a shorter learning curve and easier maintenance.
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Free Trial
Get unlimited trial usage of PDFTron SDK to bring accurate, reliable, and fast document processing capabilities to any application or workflow.
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Unlimited usage. No email address required.
