Document comparison identifies differences between two versions of a PDF by analyzing text content, layout structure, and visual appearance. The tool produces an annotated report highlighting every change.
Text comparison uses a word-level diff algorithm that identifies insertions, deletions, and modifications. Changed text is highlighted in the output: green for additions, red for deletions, and yellow for modifications. A summary panel lists all changes with page numbers.
Layout comparison detects changes in element positioning, font properties, and spacing. This catches formatting-only changes that would not appear in a text-only diff, such as adjusted margins, changed fonts, or reordered paragraphs.
Visual overlay mode renders both documents as images and composites them with configurable blending. Pixel-level differences are highlighted, making it easy to spot subtle changes in charts, images, or graphical elements.
The comparison report can be exported as a PDF with annotations, an HTML report with interactive navigation, or a structured JSON file for integration with document management workflows.