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PDiff Express - PDF Diff

By CSci Computer Science

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Compare two PDF documents - fast, incredibly easy and reliable!

What exactly has changed, what is really the same? How often do you get back a document and are still uncertain about the changes? Why is it such a hard task to juggle with revisions edited by many authors? If you just want to *see* what happened, then PDiff Express is made for you!

PDiff Express allows you to compare the content of two PDFs in order to pinpoint all textual changes. Just drag and drop two versions into PDiff and you will see all differences at a glance. This still works if fonts, layout, hyphenation or even page breaks were altered.

PDiff Express is an ideal solution to compare versions of your
• important office documents
• mission critical technical manuals
• legal texts and business contracts
• financial reports
• manuscripts and thesis texts
• scientific articles, reports, and proceedings
• fictional books and non-fiction books
• copywriting to ready-to-print layout

• fast and reliable PDF text comparison for multipage documents
• highlighting of differences (changes, insertions, and deletions) in the PDF files
• text synopsis display with synchronized text and highlighted differences
• synchronized side-by-side display of two PDFs: see corresponding words in all displays by hovering with the mouse over the text
• comparison handles layout changes (e.g. single vs. multi column), font, size and style changes, added hyphenation and different page breaks
• spot light display to distinguish text from non-text areas
• reformatting of text according to layout of the other document
• full text search function
• easy-to-use interface for best user experience
• full Unicode support for international scripts


English, German

• Both PDFs must contain searchable text (i.e. text from scans/images cannot be extracted, neither text from fonts converted to paths)
• PDFs must not be encrypted
• Text is extracted in PDF text order (i.e. regions with multicolumn layouts and tables, should have the same text order - row first or column first - in both documents)
• To test above requirements, open your PDFs in check if text is searchable and inspect text order by selecting growing regions with the mouse.

What's New in Version 1.7.0

• New toolbar
• New menu item View > Show special characters
• New menu item View > Show text flow
• Added a statistic widget to the window status bar
• Fixed a crash in conjunction with some accessibility features of OS X 10.8 and OS X 10.9 turned on (System Preferences > Accessibility)


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Customer Reviews

Useful pdf comparison tool, fails on ligatures

This is a pretty reasonable comparison tool for pdf files which displays them side by side rather nicely. How well that works will depend somewhat on your pdf. Simple pdfs work fine, more complex ones can be more challenging.

- Main issue making this unusable for me: Every ligature will be marked as a difference, which will be lots of false alarms. LaTeX produces tons of ligatures.
- The app wastes a lot of space around the actual screen real estate. On 15inch+ that's fine. But on smaller screens this can be rather painful. Full Screen mode only helps a little bit because of all the toolbar that can't be disabled and the extra bits and pieces.

But I think there's a lot of potential.

Constructive Criticisms

I just bought the application and have the followng comments.

It worked very fast on my documents (all less than 10 pages)

The comparison windows (lower two panes) do not show images or figures, just text. Would be great to show figures as well in a standard Reader format.

The comparison documents and the diff engine ignore Notes (or Comments). It would good to have a Prerference to include Comments and Notes in Diff and document views.

It would very useful to be able to output a Comparison PDF with differences in the documents 1) highlighted or 2) as Notes or Comments.

PDiff Express - PDF Diff
View in Mac App Store
  • $64.99
  • Category: Productivity
  • Updated:
  • Version: 1.7.0
  • Size: 13.3 MB
  • Seller:

Compatibility: OS X 10.6.6 or later, 64-bit processor

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