Features and techniques are disclosed for interacting with paginated digital content, including a multi-purpose tool and an annotation mode. The multi-purpose tool, which may be represented by a graphic (e.g., a movable interactive graphic), can provide access to multiple modes (e.g., copy, define, note, and/or highlight modes) that a user can invoke. The mode invoked determines the functions performed by the tool when interacting with the paginated digital content. The annotation mode, which may be invoked using the multi-purpose tool or independently thereof, can allow a user to create and edit annotations, such as highlights and notes (e.g., sticky notes, margin notes, and/or highlight notes), for paginated digital content. Editing the annotations may include selecting a desired color for the annotation, for example. The annotation mode may also allow a user to intuitively merge and delete annotations previously added to paginated digital content.