Java Comparison APIs - Compare documents for differences

APIs for merging and comparing two same format documents on any Desktop/Server environment within any Java-based application

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Java Comparison API

GroupDocs.Comparison for Java


GroupDocs.Comparison for Java is a Documents Comparison, Difference Checker and Documents Merging API. It compares both Content and Styles of the documents. Supported with out-of-the-box ‘Track Changes’ functionality producing a summary file listing the source files with the changes made. All industry standard document formats including PDF, OpenDocument, HTML, Microsoft Word, Excel, PowerPoint and Text files supported.

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Advanced Document Comparison API Features



Compares document contents of two or more files


Compare password protected files e.g Words, Cells, Slides and PDF


Compares font styles: bold, italic, underlines, strike-troughs, font types


Track all changes including deletion, insertion and formatting changes


Can be integrated easily


Optional support for built-in WebBased user interface


Generates a summary report


File IO though Java stream for reading and writing documents


Accept or reject changes in all type of comparison


Merge and compare up to three Word documents


Native Track Changes functionality: Original and the Changed document identification in Microsoft Word files


Save difference summary to DOC or DOCX format


Save HTML files to Word document


Save compared file as images


Can compare watermarks


Metered licensing

How API works

  • Get file source path as input.
  • Get file target path as input to compare with.
  • Define result path for Output.
  • Compare the source and target document.
  • Performs comparison operation and return the output (As Path, Stream) (if required)

Easy Integration

No complex document comparison workflows to find the changes within different versions but just few lines of code.

Document comparison - Java

 //Source and target files to be compared
String source = @"source.docx";
String target = @"target.docx";
Comparer comparer = new Comparer();
//Compare two documents
ICompareResult result = comparer.Compare(source, target, new ComparisonSettings());

Support and Learning Resources


GroupDocs.Comparison offers document automation APIs for other popular development environments as listed below: