It generally covers:

  1. Changes to Text: This includes changes such as typed sentences, addition or deletion of paragraphs, missing punctuation, or updated numbers, dates, or values. These edits are often difficult to detect manually.

  2. Visual or Graphic Changes: If the file includes diagrams, icons, or other visual elements, comparing PDFs points out added or deleted graphics, updated charts, replaced icons, color, or opacity changes. This is especially useful for designers and publishers.

  3. Structural Differences: Sometimes new sections are added, headings changed, or pages rearranged. Comparing PDFs can help in the detection of reordered pages, added or removed headings, or new sections or reorganized content. This ensures that the final document structure is correct.