Custom margins : Margin « PDF « Java Tutorial

1. Java Tutorial
2. PDF
3. Margin

The left margin of this document is 36pt (0.5 inch); 
the right margin 72pt (1 inch); 
the top margin 108pt (1.5 inch); 
the bottom margin 180pt (2.5 inch).

import java.io.FileOutputStream;

import com.lowagie.text.Document;
import com.lowagie.text.Element;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.pdf.PdfWriter;

public class MainClass {

  public static void main(String[] args) throws Exception {
    Document document = new Document(PageSize.A5, 36, 72, 108, 180);
    PdfWriter.getInstance(document, new FileOutputStream("1.pdf"));
    document.open();
    document.add(new Paragraph("this is a test"));
    Paragraph paragraph = new Paragraph();
    paragraph.setAlignment(Element.ALIGN_JUSTIFIED);
    for (int i = 0; i < 20; i++) {
      paragraph.add("Hello People. ");
    }
    document.add(paragraph);
    document.close();
  }
}