PDF Compare using C#.NET

venkatesh_ur

Is there any way in C#.NET to open up 2 PDF document --> Compare them (compare text, images...) --> and show the result in another PDF file?

I had tried out using iTextSharp DLL but couldnt read content from PDF file. Is there any way to do the same?

6 Replies

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Rijwan Ansari5y ago
You can try this.
https://products.aspose.com/words/net/comparison/pdf/
Satya Karki5y ago
Hi

check this: https://www.syncfusion.com/kb/9237/how-to-compare-text-in-two-pdf-documents
Kip Hackman5y ago
You can use LEADTOOLS PDF Pro SDK technology in your application.
https://www.leadtools.com/sdk/products/pdf-pro
You can use the CompareBitmapCommand class to run comparison and output the image comparison results to file.
Here is some code:
string _1stFile = @"FILE PATH TO 1ST PDF";
string _2ndFile = @"FILE PATH TO 2ND PDF";
string _compareFile = @"FILE PATH TO OUTPUT THE COMPARISON PDF";

using (RasterCodecs _codecs = new RasterCodecs())
{
    using (RasterImage _1stImage = _codecs.Load(_1stFile))
    using (RasterImage _2ndImage = _codecs.Load(_2ndFile))
    {
        // Update the transformation to align/reverse the above rotation
        LeadMatrix alignment = LeadMatrix.Identity;
        alignment.Translate(-_2ndImage.Width * 0.5, -_2ndImage.Height * 0.5);
        alignment.Rotate(20.0);
        alignment.Translate(_1stImage.Width * 0.5, _1stImage.Height * 0.5);

        // Setup the comparison options
        CompareBitmapCommand command = new CompareBitmapCommand()
        {
            Alignment = alignment,
            ReferenceImage = _1stImage
        };
        command.Run(_2ndImage);

        using(RasterImage _compareImage = command.OutputImage)
            _codecs.Save(_compareImage, _compareFile, RasterImageFormat.RasPdf, 0);
    }
}
Mageshwaran R6y ago
Hi,
Can you check with the below link:
https://www.syncfusion.com/kb/9237/how-to-compare-text-in-two-pdf-documents
Atir Tahir7y ago
Take a loot at GroupDocs.Comparison for .NET API. You can compare two files and get output with style changes detection (content inserted/deleted etc).
//Source and target files to be compared
string source = @"source.pdf";
string target = @"target.pdf";
Comparer comparer = new Comparer();
//Compare two documents
ICompareResult result = comparer.Compare(source, target, new ComparisonSettings());
result.SaveDocument("output path", "output name");
In order to learn about style detection, visit this article https://docs.groupdocs.com/display/comparisonnet/Comparison+Settings#ComparisonSettings-StyleChangeDetection
Scott Lysle18y ago
There are some third party tools that supposedly support comparison of PDFs but I don't know of a good way to show a side by side comparison. You can compare the binaries to see if they are the same or different but since that is not what you have asked about I won't address that.