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Introduction:
Commonly, document comparison aims at identifying differences between the older version and the latest version of a document. When you have a lot of PDF documents and each of them has two versions to compare, it is hard to spot all the changes by eye in a short time. This feature is convenient for those whose work involves writing or translation, for instance, proofreaders, content producers, and translators. Comparing 2 PDF files is beneficial to find out how one document differentiates the other. Is there any diff tool to compare PDFs
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The answer is yes. Using a PDF comparison tool will relieve you from manually finding alterations one by one. Check the following content to learn how to compare two PDF files with the introduced PDF-compare tools.  

How to Compare Two PDF Files on Windows

Soda PDF

Soda PDF is a feature-rich diff tool that has abilities to edit, convert, secure, annotate, and compare text in PDFs. With this PDF comparison tool, you can easily compare PDF documents in two versions of a PDF and check the automatically highlighted discrepancies. This software is available on Windows 10 (desktop app), Windows 8, and 7.  

Let's dive into how to compare two PDF files on Windows with this handy program.

Step 1: Launch the PDF comparison software. Tap COMMENT on the top and choose Compare in the secondary toolbar;  

soda-pdf-compare-for-differences-windows

Step 2: In the appearing dialog box, import the previous and new versions of the PDF you want to compare. Specify a page range for PDF comparison;

Step 3: Press Compare button to compare two PDF files. Seconds later, the PDF comparison will be completed and the results will be displayed side by side.

Foxit PDF Editor

If you want to compare PDFs for finding out changes made in the revised one, Foxit PDF Editor hits the spot. Its PDF comparison feature allows you to compare text or tables in two versions of the same PDF. When the comparison is completed, the PDF comparison tool will automatically generate a report with comparison results. In the report, a summary of the changes will be given and the two files are shown side by side with differences highlighted.

Here is a brief instruction for using this PDF comparison software to compare 2 PDF files on Windows.

Step 1: In the PDF program, go to View and select Compare in the sub-menu bar;

Step 2: Within the pop-up Compare PDF Files dialog box, click Choose in the Old File and New File sections respectively to import the earlier and new PDFs you need to compare. Select a page range;

foxit-editor-compare-two-pdfs-for-changes

Step 3: Hit Options to change the default settings for PDF comparison results. Press the OK button to compare PDF files.

Tips:In the “Options” dialog box, you can click a checkbox to compare text or tables in the two PDF files. In addition, ticking the “Detect Page Deletions or Inserts” will help identify what’s deleted or inserted.

By the way, when the need arises, both the two programs can help compare two text files. The way to do that is to copy and paste text to Word and convert Word to PDF and then compare the PDFs.

How to Compare Two PDF Files on macOS 

PDiff

While the industrial leader, Adobe Acrobat Pro is sure to compare PDFs on Mac devices, its price has prompted many users to find alternatives. If you are one of them, how do you compare PDF files without Adobe Acrobat? The PDF comparison tool, PDiff might be a choice. The application is designed to compare the text differences between two PDF files. From the comparison results, you can see what’s inserted, deleted, replaced, or rearranged. It can also display two copies of a PDF with different fonts or layouts.

Follow the steps below to compare PDFs on Mac.

Step 1: Open the PDF comparison software, then import the original and revised PDF documents you wish to compare text in;

pdiff-compare-two-pdf-files-macos

Step 2: Check the comparison results shown at the bottom. Click a word in the left or right results part to navigate to the differences in the file. To find character changes, go to Window on the top and choose Differences;   

Step 3: Click the File tab and select Save annotated PDF to export the PDF comparison results as a document.

When needed, you can open the PDF comparison report in Adobe Acrobat to check all the discrepancies between the two PDFs. The comment feature in Acrobat allows you to reply to the changes.   

How to Compare Two PDF Files Online

Draftable

As one of the best diff tools, Draftable makes it easier than ever to compare PDF files with its state-of-art comparison technology. Besides that, the online software enables you to compare two Word files or two PowerPoint files as well. To be specific, it can also compare a Word document with a PDF. All of the differences and modifications will be marked for easy future examination when the comparison is complete. With the online tool, you can compare PDF documents for free without registering or downloading any application.

Take a look at how to compare two PDF files side by side online using the diff checker.

Step 1: Search Draftable compare pdf in Chrome and enter into its web page. Click the up arrow or Choose file within the workplace to upload the older and newer PDFs you are to compare;   

draftable-compare-two-pdf-files-online

Step 2: Press Compare button to compare the uploaded PDF documents;

Step 3: After the PDF comparison results come out, the changes will turn up on the right side. You can choose to only see the content changes or style changes. Click a result in the changes list to jump to the corresponding content. 

Aspose 

Aspose is another easy-to-use online PDF comparison tool, which is listed both in Apple’s App Store and Google Play. The software can also convert, merge, split, edit PDF documents, compare text in PDFs, and more. The PDF comparison feature helps highlight the differences between two PDFs in a comparison report. 

Check how the online PDF comparison software compares two PDF files.

Step 1: Search Aspose compare pdf on the Internet and go to the home page. Drop or upload the two versions of your PDF file to the interface;

Step 2: Click Compare and the PDF-compare tool will compare two PDFs automatically;

aspose-compare-two-pdf-files-free

Step 3: When the PDF comparison is completed, hit the DOWNLOAD button to download the comparison report with marked differences.

Note:This online PDF comparison tool is not able to compare PDFs in side-by-side mode.

How to Compare Different Pages in PDF Side by Side

SwifDoo PDF provides 3 split-screen modes for viewing a PDF document, in which the screen will be split horizontally, vertically, or quarterly. Therefore, users can easily read and compare previous pages and later pages in one PDF document. So this is how you can compare PDFs to quickly read them. 

swifdoo-pdf-side-by-side-compare-tool

The advantage of using SwifDoo PDF software is it can be a PDF annotator, PDF converter, PDF editor, and PDF splitter at the same time. With this comprehensive PDF solution, you are able to fulfill dozens of PDF-related tasks as needed.

                                                                Free Download

What is the Best PDF Comparison Tool?

Whether you want to compare a PDF to a PDF document or a PDF to a Word document, the methods above will meet your needs. Users can choose the most acceptable tool based on the requirements of comparison results. For example, if you only compare text in two PDF files, you may not need to use those tools that can compare multiple types of documents. 

If you are looking for an all-around PDF application for manipulating PDF documents, try SwifDoo PDF. During the promotion, SwifDoo PDF's one-time license is offered at only $99.9, a super cost-effective price. And, a newly registered user will have a 14-day free trial without feature limitations. So, get it for free now!                                

Susy

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Susy has worked with PDF tools for more than 5 years. During the past time, PDF software is of huge assistance in increasing her productivity. She joined SwifDoo PDF one year ago and works as an editor now. Based on a lot of research and tests, Susy can offer users professional and practical solutions to PDF issues.