| Class | Description |
 | PdfAnnotation | Provides the base class that contains information about PDF annotation. |
 | PdfAnnotationAdditionalActions | Stores additional-actions defining the annotation's behavior in response to various trigger events. |
 | PdfAnnotationAppearanceCharacteristics | Stores appearance characteristics to be used in constructing a dynamic appearance stream specifying the annotation visual presentation on the page. |
 | PdfAnnotationAppearanceGenerator | Represents a base class of appearance generators for PDF annotations. |
 | PdfAnnotationAppearances | Represents the appearances, which are specifying how the annotation is presented visually on the page. |
 | PdfAnnotationBorderEffect | Stores information about border effect of PDF annotation. |
 | PdfAnnotationBorderStyle | Stores information about border style of PDF annotation. |
 | PdfAnnotationCodec | Provides the base abstract codec that allows to export and import PDF annotations. |
 | PdfAnnotationEventArgs | Provides data for PDF annotation events. |
 | PdfAnnotationIconFit | Specifies how to display the widget annotation's icon within its annotation rectangle. |
 | PdfAnnotationList | Represents a collection of PdfAnnotation objects. |
 | PdfAnnotationsRelationsHelper | Contains methods to simplify work with annotations relations. |
 | PdfAnnotationXfdfCodec | Exports PDF annotations to XFDF format and imports PDF annotations from XFDF format. |
 | PdfCaretAnnotation | Represents a PDF annotation that displays a visual symbol that indicates the presence of text edits. |
 | PdfCaretAnnotationAppearanceGenerator | An appearance generator for a PDF caret annotation. |
 | PdfCircleAnnotation | Represents a PDF annotation that displays a circle. |
 | PdfCircleAnnotationAppearanceGenerator | An appearance generator for a PDF circle (ellipse) annotation. |
 | PdfFileAttachmentAnnotation | Represents a PDF annotation that stores a file attachment. |
 | PdfFileAttachmentAnnotationAppearanceGenerator | An appearance generator for a PDF File Attachment annotation. |
 | PdfFreeTextAnnotation | Represents a PDF annotation that displays an editable text area and a callout line used to point to the area of PDF page. |
 | PdfFreeTextAnnotationAppearanceGenerator | An appearance generator for a PDF free text annotation. |
 | PdfInkAnnotation | Represents a PDF annotation that displays a freehand lines composed of one or more disjoint paths. |
 | PdfInkAnnotationAppearanceGenerator | An appearance generator for a PDF Ink annotation. |
 | PdfLineAnnotation | Represents a PDF annotation that displays a line. |
 | PdfLineAnnotationAppearanceGenerator | An appearance generator for a PDF line annotation. |
 | PdfLinkAnnotation | Represents a PDF annotation that displays a link. |
 | PdfLinkAnnotationAppearanceGenerator | An appearance generator for a PDF link annotation. |
 | PdfMarkupAnnotation | Provides the base class that represents a PDF markup annotation. |
 | PdfOfficeDocumentAnnotation | Represents a VintaSoft PDF annotation that stores a office document. |
 | PdfPaperMetaDataGenerationParameters | Contains information about PaperMetaData generation parameters, which contains instructions to a barcode encoding module of a conforming reader on how to generate the barcode image. |
 | PdfPolygonalAnnotation | Provides the base class that represents a PDF point-based (polyline, polygon) annotation. |
 | PdfPolygonalAnnotationAppearanceGenerator | An appearance generator for a PDF polygonal (polygon, polyline) annotation. |
 | PdfPolygonAnnotation | Represents a PDF annotation that displays a polygon. |
 | PdfPolygonAnnotationAppearanceGenerator | An appearance generator for a PDF polygon annotation. |
 | PdfPolylineAnnotation | Represents a PDF annotation that displays a polyline. |
 | PdfPolylineAnnotationAppearanceGenerator | An appearance generator for a PDF polyline annotation. |
 | PdfPopupAnnotation | Represents a PDF annotation that displays text in a pop-up window for entry and editing. |
 | PdfProjectionAnnotation | Represents a projection annotation (PDF 2.0) that has much of the functionality of other markup annotations. |
 | PdfRectangularAnnotation | Provides the base class that represents PDF rectangular (square, circle) annotation. |
 | PdfRectangularAnnotationAppearanceGenerator | An appearance generator for a PDF rectangular (square, circle) annotation. |
 | PdfRubberStampAnnotation | Represents a PDF annotation that displays a rubber stamp. |
 | PdfSquareAnnotation | Represents a PDF annotation that displays a square. |
 | PdfSquareAnnotationAppearanceGenerator | An appearance generator for a PDF square annotation. |
 | PdfTextAnnotation | Represents a PDF annotation that displays a "sticky note" attached to a point in the PDF document. |
 | PdfTextAnnotationAppearanceGenerator | An appearance generator for a PDF text (comment) annotation. |
 | PdfTextMarkupAnnotation | Represents a PDF annotation that can appears as highlight, underline, strikeout, or jagged ("squiggly") underline in the text of document. |
 | PdfTextMarkupAnnotationAppearanceGenerator | An appearance generator for a PDF text markup annotation (highlight, underline, strikeout, squiggly). |
 | PdfWidgetAnnotation | Represents a PDF Widget annotation that displays interactive element. |