25+ Useful Document and File Comparison Tools

Figuring out how a document has changed from one version to another isn’t always the simplest task. It’s further complicated when that document is longer or more complex, like source code.

The tools collected here can help you analyze and compare your documents and files, as well as merge them if necessary. There are tools to compare everything from Word docs to WAV files, and everything in between (including plenty that support syntax highlighting for code). Some are free and some are paid, and there are options available for Mac OS X, Windows, and Linux.

File and Document Comparison Tools

Beyond Compare Version 3

Beyond Compare lets you easily compare files and folders, including text files (with syntax highlighting for HTML), Word Docs, and PDF files, among others. Available for Windows and Linux for $30 (standard edition) to $50 (pro edition).

beyond compare document comparison

Kaleidoscope

Kaleidoscope lets you compare text documents (including source code) and images. It has built-in integration with other programs, and can read .psd, .txt, .png, .jpg, and .html files. Available for Mac OS X for €29.

File Comparison with Kaleidoscope

Workshare Compare

Workshare Compare is an enterprise-level document comparison tool that lets you compare Word documents and text-based PDFs. You can compare one document to multiple others. It’s available for Windows for $145 for a one-year subscription. There’s also a Basic version for $99/year that only compares Word documents.

Workshare Compare document comparison tool

Docu-Proof Enterprise

Doc-Proof works to compare XML, Word, text, and PDF files. It makes it possible to quickly compare fonts, sizes, deletions, insertions, spelling, and location.

docu proof enterprise documentation inspection software

ExamDiff

ExamDiff is a freeware visual file comparison tool for Windows. It includes automatic change detection, one-click recompare, drag and drop support, and is fully customizable. There’s also a Pro version with more features for $34.99.

ExamDiff one-click recompare tool

Diff Doc

Diff Doc can be used to compare Word, Excel, PowerPoint, PDF, RTF, text, HTML, XML, and other document types. It’s available for Windows.

Compare Files with Diff Doc

Compare Suite

Compare Suite lets you compare by keyword, compare two folders, ignore certain words, and includes syntax highlighting to make it easier to compare code documents. Compare Suite is available for Windows for $70 for a single user license.

Compare Suite File Comparison Software

WinMerge

WinMerge is an open source differencing and merging tool for Windows. It shows comparisons visually and makes it easy to merge documents.

WinMerge Document Comparison Tool

Araxis Merge

Araxis Merge is a three-way document comparison, merging, and folder synchronization tool. It can be used to compare source code, web pages, XML, and other text files, as well as Word and Excel documents, PDFs, and RTF files. It’s available for both Windows and Mac OS X for $129 for the Standard version and $269 for the Professional version.

Araxis Merge three-way document comparison

Changes

Changes lets you sync folders, compare both code and prose, and even compare right inside a variety of text and code editors (including Coda and TextWrangler). Changes are available for Mac OS X for $49.95 for a single license.

Changes mac os file comparison tool

CodeCompare

CodeCompare is a source code comparison tool built on the .NET framework that includes support for syntax highlighting, Visual Studio integration, three-way merge, version control integration, and folder synchronization. Basic functionality is free, but there’s also a Pro version for $49.95.

CodeCompare three-way merge software

Compare++

Compare++ has built-in analysis functions for C/C++, C#, Java, CSS3 and more. It’s available for Windows for $29.95 for a single user.

Compare++ Code Compare Tool

DiffMerge

DiffMerge is a free document comparison and merging tool for Windows, Mac OS X, and Linux. It includes full editing support for compared files, and merging for up to three files.

DiffMerge free document comparison tool

Pretty Diff

Pretty Diff is a free web app for comparing code, written entirely in JavaScript.

Pretty Diff Web-based diffrence tool

Kompare

Kompare is a graphical difference viewer that lets you compare two text files It’s included in the KDE Software Development Kit.

Kompare graphical difference viewer

UltraCompare

UltraCompare is a file and folder compare utility that works for text files, Word documents, zip files, and jar archives. In addition to local/network directory compare, it also supports FTP compare. It’s available for Windows for $49.95.

UltraCompare folder compare tool

Code Difference Comparison Tool

This is a free, bare-bones, web-based comparison tool. Just enter the master text and the second text and choose whether you want it compared inline or side-by-side.

Code Difference Free Comparison Tool

Diffuse

Diffuse is a free Python text comparison and merge tool for Windows and Linux.

Diffuse free Python text comparison tool

Compare & Merge

Compare & Merge is a file comparison and merging utility for source code, HTML, XML, and other text-based files. It’s available for Windows for $39.95.

Compare & Merge File Comparison Tool

Active File Compare

Active File Compare has syntax highlighting support for C++, C#, Java, Visual Basic, HTML, PHP, XML, and many other programming languages. It can also compare files that exist in Zip, Tar, and GZip archives. It’s available for Windows for $15.95 for a business license or $9.95 for a personal license.

Active File Compare Document Comparison Tool

Colored Diffs

Colored Diffs is a Thunderbird plugin for highlighting differences in CVS or SVN email notifications about changes made by other users.

Colored Diffs Thunderbird extension

Compare It! 4

Compare It! lets you compare not only text files, but also binary and image files, and includes an editing engine. It’s available for Windows for $29.

Compare It! 4 binary and image files compare

Compare PDF

Compare PDF has support for both PDF and text file comparisons. It can be integrated with other software products. Compare PDF is available for Windows for $35 for a single user license.

Compare PDF file Comparison Tool

DiffPDF

DiffPDF is a free program that lets you compare two PDF files, with both text and appearance views (to check things like reformatting of a paragraph or if an image is changed). There are versions for Windows, Mac OS X and Linux.

DiffPDF PDF compressor

Meld

Meld is a free visual comparison and merging tool for Linux. It allows for comparison of two or three documents, and in-place edits. It also allows folder comparisons.

Meld free visual comparison and merging tool

Files Compare Tool

Files Compare Tool is a visual comparison app for files and directories. It offers color-coded side-by-side comparison and a powerful editing engine.

Files Compare Tool visual comparison app

Quick Diff Online Tool

Quick Diff is a simple, free online comparison tool. Just copy and paste the two bits of text you want to compare, and indicate whether you want it to compare side-by-side or inline.

Quick Diff free online comparison tool

FourierRocks

FourierRocks is a graphical WAV file comparison tool. It’s open source, and works on the .NET framework.

FourierRocks sound comparison tool

Conclusion

The tools above can be a great way to compare documents and files. But don’t overlook the document comparison tools built into many programs developers and designers already use. Dreamweaver has built-in tools for comparing documents. So does Google Docs. Even WordPress has comparison tools for posts and pages. Leave us a comment and tell us what your favorite comparison tools are?

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Cameron Chapman is a professional Web and graphic designer with many years of experience. She writes for a number of blogs, including her own, Cameron Chapman On Writing. She’s also the author of Internet Famous: A Practical Guide to Becoming an Online Celebrity.

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