System Requirements

Try or Buy

The rapid, widespread, and by now nearly complete, adoption of PDF-based workflows over the last decade has eliminated many of the issues that came with previous approaches. Delivering PDF files gives content creators a lot more control over their work than they ever had before.

This increased control can have disadvantages as well as advantages. Along with the control comes a much higher level of responsibility. If the content of a PDF file you deliver contains an error, it may be your responsibility!

Each time you generate a new PDF file, it’s critical to know that all desired changes have been made, and, just as importantly, that no unwanted changes have crept in; PDF Comparator makes quick work of both!

Unlike many other tools, that compare two PDF files’ text or image content, PDF Comparator actually renders each page to a raster image, and then compares those images on a pixel-by-pixel basis, ensuring that the comparison is made on how the pages will actually print.

Hover over each of the three rectangles in the  screen shots above-left to see how a detected  difference is displayed.

We are pleased to announce PDF Comparator 4, the next major version of our popular PDF Comparison tool.


PDF Comparator 4 is now available for Microsoft Windows as well as macOS. We have both 32- and 64-bit versions available for Windows. The Mac version is available as a 64-bit application only.

Click the Try or Buy tab above to download or to buy a license. Without a license, PDF Comparator will run in demo mode.

Contact us to request a 30-day license key which will allow you to run the application without the demo mode restrictions.

Fine-grain control

  • Set rasterization resolution and detection sensitivity in fine increments.


  • Auto-compare all pages with the push of a button. Then, examine only dissimilar pages.
  • Save settings for later use.
  • "Package" complete jobs for later reference.

Comments and text comparison

  • Do you use PDF comments to track requested changes? PDF Comparator can display those annotations, and allow you to zoom into their locations on the page:


  • Compare the text content of the PDF pages with the ability to zoom into the text on the page display:










  • PDF Comparator 4 is available in both macOS (64-bit) and Microsoft Windows (32- and 64-bit) versions.

Page organization/layout

  • Do you need to compare PDF files with extra/missing pages, or with pages in a different order? Need to compare a single page PDF with one in readers’ spreads? No problem; PDF Comparator allows you to horizontally split, re-order, and/or ignore any PDF page(s).

Rotation and scaling

  • Do you need to compare PDFs at different rotations? At different scale factors? PDF Comparator allows each PDF to be rotated and/or scaled independently of the other.

Layer support

  • Set PDF layers to be considered or ignored during the comparison process.

Alignment and area to compare

  • Align to page trim or bleed, by selecting a common rectangle on each of the two pages, or by clicking on two points, on in each PDF.
  • Restrict the comparison to one of the standard PDF “boxes” or to an arbitrary rectangle you specify.


Mac, Mac OS, and macOS are registered trademarks of Apple Inc. • Microsoft Windows is a registered trademark of Microsoft Corporation • Adobe, Acrobat, and Adobe Photoshop are either registered trademarks or trademarks of Adobe Systems Incorporated in the United States and/or other countries.

Minimum Requirements:

Mac: Mac OS X 10.7 or newer
4 GB RAM or more recommended

The macOS version of PDF Comparator 4 is only available as a 64-bit application.


Windows: Windows 7 or newer
2 GB RAM minimum, 4 GB or more recommended

If you are running a 64-bit Windows operating system, we highly recommend that you install the 64-bit version.

Please download and try PDF Comparator before you buy.


Contact us to get a fully-functioning 30-day trial license key.

(The application will run in demo mode without a license key. )

Download PDF Comparator 4 for macOS

Download PDF Comparator 4 for 64-bit Windows

Download PDF Comparator 4 for 32-bit Windows

Purchase or Upgrade a License

The same license key can be used for any of the three versions.

You may activate/deactivate whenever and as often as you like.


Purchase as many “seats” as you need to have activated at the same time, regardless of platform.

Copyright ©2015-2018 Premedia Systems, Inc.  –  All Rights Reserved