I’m working in a console application targeting .NET v8. I’m using PDFsharp nuget package for PDF file generation. I’m using below code to compress a PDF file of 75 KB. The PDF file mostly contains text.

using PdfSharp.Pdf;
using PdfSharp.Pdf.IO;

using (var stream = new MemoryStream(File.ReadAllBytes("D:\test.pdf")) { Position = 0 })
using (var source = PdfReader.Open(stream, PdfDocumentOpenMode.Import))
using (var document = new PdfDocument())
{
    var options = document.Options;
    options.FlateEncodeMode = PdfFlateEncodeMode.BestCompression;
    options.UseFlateDecoderForJpegImages = PdfUseFlateDecoderForJpegImages.Automatic;
    options.CompressContentStreams = true;
    options.NoCompression = false;
    options.EnableCcittCompressionForBilevelImages = true;

    foreach (var page in source.Pages)
    {
        document.AddPage(page);
    }

    document.Save("D:\testout.pdf");
}

The output file that I get is of 73 KB. So I get reduction of 2 KB only. Is there any way to reduce its size significantly using compression?