PDF Annotation Server

Document Engine includes support for importing, creating, removing, and flattening PDF annotations. It offers developers a robust API for programmatic annotation management, as well as integration with our client-side SDKs for manual annotation through a UI.

Key Capabilities

17 Annotation Types

Highlight, text, ink, note, shape, and more

PDF, Office, Images

Annotate PDF, MS Office, JPG, TIFF, and more

Create, Edit, Remove

Programmatically or via integrated PDF viewers

Import and Export

Manage annotations in XFDF or JSON files

Cloudy Annotations

Cloudy border effect

Data Management

Maintain independent layers for each user's data


Add signing, editing, forms, and more

What Are Annotations?

Content displayed as a PDF page isn’t suitable for easy editing, but the PDF specification defines a comprehensive set of objects that can be added to PDF pages without changing the page content. These objects are called annotations, and their purpose ranges from marking up page content to implementing interactive features such as forms.

Essential Guides

Import and Export

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