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Ellipse annotations in PDF viewer components are shape‑based markups that allow users to draw oval or circular outlines (or filled ellipses) on PDF pages. Such annotations are valuable in highlighting regions, drawing attention to content, or visually marking up documents for review without altering the underlying text. They generally include settings for border color, line width, fill color or transparency, and may offer popup notes, captions, or comments associated with the ellipse shape. The feature supports both interactive use and programmatic control in many viewers.

Several React PDF viewer controls offer support for ellipse annotations including:

• Document Solutions for PDF by MESCIUS provides a CircleAnnotation class allowing users to place an ellipse on a page and configure its position.
• Syncfusion PDF Viewer (part of Syncfusion Essential Studio Enterprise) supports ellipse shape annotations and customize stroke and fill color, thickness and opacity.
• PrizmDoc Viewer by Accusoft allows users to draw, edit, or delete ellipse annotations, add comments, and control the display settings of those annotations.

For an in-depth analysis of features and price, visit our React PDF viewer controls comparison.

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