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Comparison for Net

Compare documents with ease in your C# .NET solutions

Build C# applications with a flexible document comparison API that enables file comparison by content and style across various document formats.

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// Specify the source document
using (Comparer comparer = new Comparer("source.docx"))
{
    // Add one or more target documents
    comparer.Add("target.docx");

    // Specify comparison options
    CompareOptions options = new CompareOptions() 
    {ShowRevisions = false};

    // Compare and save result
    comparer.Compare("result.docx", options);
}

dotnet add package GroupDocs.Comparison

GroupDocs.Comparison at a glance

API to compare differences between documents in .NET applications

File comparison in C#

Detect differences between source and target files for changes at paragraphs, words, and character levels. Identify styling and formatting changes like bold, italic, underlines, strike-troughs, font types, etc.

Most popular file and document formats are supported

GroupDocs.Comparison API allows for efficient document comparison across a wide range of formats, including PDF, HTML, emails, Microsoft Office documents (Word, Excel, PowerPoint, OneNote, Visio), various image types (JPEG, PNG, GIF, BMP), text files, and more.

Apply or reject changes easily

Each difference identified in the compared documents using the GroupDocs.Comparison API can be selectively applied or rejected, enabling customization before exporting to the final output document.

Comparison summary report

Generate a summary report of differences, detailing all the changes found in the compared documents, and save it for reference.

Platform independence

GroupDocs.Comparison for .NET supports the following operating systems, frameworks and package managers

Supported file formats

GroupDocs.Comparison for .NET supports operations with the following file formats.

Microsoft Office & OpenDocument formats

Word: DOCX, DOC, DOCM,DOT, DOTM, DOTX, RTX, RTF, TXT
Excel: XLSX, XLS, XLT, XLTM, XLSB, XLSM
PowerPoint: PPTX, PPT, POT, POTX, PPS, PPSX
Outlook: EML, EMLX, MSG
OneNote: ONE
OpenDocument: ODT, ODP, OTP, ODS, OTT
Fixed Page Layout: PDF

Images, Graphics & Diagrams

Raster images: BMP, GIF, JPG, JPEG, PNG
Medical Imaging: DICOM
Microsoft Visio: VSDX, VSD, VSS, VST, VDX
AutoCAD Drawing: DWG, DXF

Other

Text: TXT
Programming Languages: CS, Java, CPP, JS, PY, RB, PL, ASM, GROOVY, JSON, PHP, SQL, LOG, DIFF, LESS, SCALA
Web: HTM, HTML, MHT, MHTML
e-Books: MOBI, DjVu
Delimiter-Separated Values: CSV

GroupDocs.Comparison features

Easily compare PDF and Office documents, images and other formats

Easy to use document comparison

Aanalyze and identify differences between two documents.

Compare multiple documents

Simultaneously analyze and identify differences across multiple documents.

Supported formats

Compatible with over 50 widely-used document formats from various categories, ensuring broad applicability.

Accept or reject changes

Сlear visual display of detected changes, complete with options to either accept or reject these modifications.

Generate previews

Ability to save comparison results as image previews for easy reference and sharing.

Content comparison

Conduct thorough text comparisons at various levels - including line-by-line, paragraph, word, and character - with highlighted differences for better clarity.

Style and formatting comparison

Detects and highlights alterations in document formatting and style, ensuring comprehensive review.

Flexible metadata settings

Preserve metadata from source or target files, or customize it according to user preferences.

Password protection

Analyze password-protected documents and secure the output document with password encryption for added security.

Selective page comparison

Load and compare specific sections or pages of a document for targeted analysis.

Display comments

Choose to display or hide comments when loading the source document, offering greater control over the comparison process.

Code samples

Some use cases of typical GroupDocs.Comparison for .NET operations

Comparing password-protected documents.

To compare documents that are protected with a password, you need to specify it then loading the documents:

How to compare password-protected documents.

// Load the source document and specify its password
using(Comparer comparer = new Comparer("source.docx", new LoadOptions() {Password = "1234"}))  
{
    // Load the target document and specify its password
    comparer.Add("target.docx", new LoadOptions() {Password = "5678"});

    // Save comparison result to a specified file
    comparer.Compare("result.docx");
}

Comparing multiple PDF documents.

GroupDocs.Comparison allows you to compare more than two documents. The operation is almost the same as when comparing two files. You just need to add more target files to the comparer class.

How to compare three or more documents.

// Load the source document
using(Comparer comparer = new Comparer("source.docx") 
{
    // Specify the second file for comparison
    comparer.Add("target2.docx");
    
    // Specify the third file for comparison
    comparer.Add("target3.docx");
    
    // Save comparison result to a specified file
    comparer.Compare("result.docx");
}