The SDK's Annotation module supports document markup and collaboration features, from simple highlights to redaction.
- Links — interactive navigation to URLs, other pages, or custom actions.
- Markup annotations — highlighting, underlining, and strikethrough for review workflows.
- FreeText annotations — text notes and comments placed anywhere on a page.
- Shape annotations — lines, squares, circles, polylines, polygons, and freehand ink drawing.
- Redactions — permanently remove sensitive underlying text or images (not just a visual overlay).
- Stamps — standard or custom stamps such as Approved, Draft, or Confidential.
Note: True redaction removes the underlying content permanently; a highlight or blackout shape drawn on top of text does not. If compliance requires content to be unrecoverable, use the Redaction capability rather than a visual markup.