How to Eliminate Excess Whitespace When Merging PDFs in C#?

How to Remove Whitespace on Merge

Problem:
When merging multiple PDF documents, each page is considered a full page even if there's only a small amount of content, resulting in vertical whitespace in the merged document.

Solution:

Using the PdfVeryDenseMergeTool Class (C#):

public class PdfVeryDenseMergeTool
{
    // ... (rest of the class)
    protected Rectangle PageSize;
    protected float TopMargin;
    protected float BottomMargin;
    protected float Gap;
    protected Document Document;
    protected PdfWriter Writer;
    protected float YPosition = 0;

    public PdfVeryDenseMergeTool(Rectangle size, float top, float bottom, float gap)
    {
        // ... (rest of the constructor)
    }

    public void Merge(MemoryStream outputStream, List<PdfReader> inputs)
    {
        // ... (rest of the method)
    }
}

Using the PageVerticalAnalyzer Class (C#):

public class PageVerticalAnalyzer : IRenderListener
{
    // ... (rest of the class)
    public List<float> VerticalFlips = new List<float>();

    // ... (rest of the methods)
}

Code to Gather Files and Run the Tool (C#):

public void TestMergeDocuments()
{
    PdfVeryDenseMergeTool tool = new PdfVeryDenseMergeTool(iTextSharp.text.PageSize.A4, 18, 18, 10);
    List<byte[]> Files = new List<byte[]>();

    // ... (code to load files)

    using (MemoryStream ms = new MemoryStream())
    {
        List<PdfReader> files = new List<PdfReader>();
        foreach (byte[] ba in Files)
        {
            files.Add(new PdfReader(ba));
        }
        tool.Merge(ms, files);
        // ... (save the file using ms.GetBuffer())
    }
}

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