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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.
Preserve the original document by keeping dynamic annotations & discussions in an external XFDF file — a standards-compliant format for annotation interchange.
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.
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.
Ensure a trustworthy representation of annotations across all devices and browsers with built-in support for 'Appearance Streams'.
Embed slick & ready-to-use annotation tools & widgets. Or, create unique annotation experiences with the power & flexibility of complete source code customization. No limits!
Code samples, familiar package managers, and a Docker image make it easy to get up and running.
Our core document engine has been perfected by 20 years of knowledge, innovation, and real-world testing.
An open source UI gives you complete freedom to match your look & feel, and optimize the user experience.
A single API with consistent function calls across platforms means a shorter learning curve and easier maintenance.