Document comparison identifies differences between two versions of a PDF by analyzing text content, layout structure, and visual appearance.
Text comparison uses a word-level diff algorithm that identifies insertions, deletions, and modifications.
Layout comparison detects changes in element positioning, font properties, and spacing.
Visual overlay mode renders both documents as images and composites them with configurable blending.
The comparison report can be exported as a PDF with annotations, an HTML report, or a structured JSON file.