Compare PDF Documents, Find Differences, and Accept or Reject Changes using C#

readme.md

Related blog post: Compare PDF Documents using C#

AcceptRejectPdfComparisonChanges.cs

/*
 * Accept and reject identified changes by comparing PDF documents using C#
 */
using (Comparer comparer = new Comparer(@"path/document-1.pdf"))
{
    comparer.Add(@"path/document-2.pdf");
    comparer.Compare();
    ChangeInfo[] changes = comparer.GetChanges();
    
    // Rejecting the first identified change and it will not be added to result document
    changes[0].ComparisonAction = ComparisonAction.Reject;
    comparer.ApplyChanges(@"path/rejected-change-result.pdf", new ApplyChangeOptions { Changes = changes, SaveOriginalState = true });

    changes = comparer.GetChanges();
    changes[0].ComparisonAction = ComparisonAction.Accept;
    comparer.ApplyChanges(@"path/accepted-change-result.pdf", new ApplyChangeOptions { Changes = changes });
}

CompareMultiplePdfFiles.cs

/*
 * Compare Multiple PDF Documents using C#
 */
using (Comparer comparer = new Comparer(@"path/document-1.pdf"))
{
    comparer.Add(@"path/document-2.pdf");
    comparer.Add(@"path/document-3.pdf");
    comparer.Add(@"path/document-4.pdf");

    comparer.Compare(@"path/compare-result.pdf");
}

ComparePDF.cs

/*
 * Compare Two PDF Documents and Highlight Changes using C#
 */
using (Comparer comparer = new Comparer(@"path/document-ver1.pdf"))
{
    comparer.Add(@"path/document-ver2.pdf");
    comparer.Compare(@"path/compared-result.pdf");
}

CompareProtectedPdfFiles.cs

/*
 * Compare Password Protected PDF Documents using C#
 */
using (Comparer comparer = new Comparer(@"path/protected-document-1.pdf", new LoadOptions(){ Password = "SourceFilePassword" }))
{
    comparer.Add(@"path/protected-document-2.pdf", new LoadOptions() { Password = "TargetFilePassword" });
    comparer.Compare(@"path/compared-protected-docs-result.pdf");
}