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Comparing two PDF documents
The Compare Two Documents and Compare Two Versions Within a Signed Document
commands are two similar commands that compare every page in two documents. Both
commands look at PDF information that describes the pages precisely, enabling them to
find even the most subtle differences between pages. With the Compare Two Documents
command, you compare pages in two separate documents; with the Compare Two
Versions Within a Signed Document command, you compare two versions of the same
signed document. With the Compare Two Versions Within a Signed Document command,
changes made at each signature checkpoint are displayed.
In the comparison file, each document begins with a summary page that gives the
document's filename and the number of pages containing hidden and visual differences,
depending on the parameters used in the comparison. Subsequent pages in the file show
a side-by-side comparison of the pages that differ, with the differences highlighted.
A header on each page identifies the file and the differences found on the page.
The differences are highlighted in magenta on the pages. Acrobat identifies differences in
these ways:
If any pixels differ on the two pages, the specific differences are highlighted on both
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pages. For example, a word may have been edited or deleted, or a comment may have
been added.The change may also be one that is barely noticeable, such as a slightly
different tab stop or a small shift of the page's content to one side.
Differences highlighted on both pages
If no pixels differ but the PDF information on the pages differs, both pages are entirely
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highlighted. For example, some PDF marking behind an opaque object may have
changed, or the crop box may have changed without any additional cropping being
obvious.
If a page has been added, it is paired with a new blank page. If a page has been deleted,
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it is represented by a blank page and paired with its corresponding page in the other
document.
The highlighted differences are stored as pencil comments in the comparison file. You can
use the Comments palette to see a list of all the differences, and you can double-click a
difference in the palette to go to that place on a page.
Note: The side-by-side display of pages in comparison files is designed for two-up printing.
If you are printing only one page, select Fit to Page in the Print dialog box to be sure you
include all highlights and the page numbering in the printed copy.
To compare pages, words, and fonts between two documents:
1 Choose Tools > Compare > Two Documents.
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