PDF Comments & Annotations
Annotations are markup elements drawn over the primary PDF canvas. They are defined in the /Annots array of a page dictionary. Unlike base text, annotations (like Sticky Notes or Highlights) often contain secondary popup text or author metadata.
These files help verify that your rendering engines correctly paint these overlays, and that your text extraction tools correctly pull (or ignore) the hidden text buried inside a comment popup rather than treating it as part of the main document flow.
Sticky note annotation
A document containing interactive sticky notes that trigger `/Popup` dictionaries when clicked.
Comment annotation
A document containing standard editorial comments and text replacement markers.
Ink annotation
A document containing free-hand drawings (signatures or scribbles) using the `/Ink` annotation array.
Highlight annotation
A document heavily marked up with `/Highlight` annotations spanning multiple lines to test quad-point bounding box logic.
Underline annotation
A document featuring various squiggly and standard underline annotations.
Frequently Asked Questions
Use Cases
- Validating Data Loss Prevention (DLP) tools to ensure sensitive editorial comments are stripped before external publication.
- Testing web-viewers to ensure interactive `/Popup` windows correctly trigger when a user hovers over a sticky note.
- Ensuring e-discovery tools successfully extract editorial history and author names attached to annotations.