Changing page sizes of existing PDFs

5th November 2015
admin-marketing

iText 5 is no longer being developed, except for security fixes. Click the following link to see an updated example for iText 7.

This example was written in answer to the question How to extend the page size of a PDF to add a watermark?

AddExtraMargin.java
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/**
 * This example was written by Bruno Lowagie in answer to the following StackOverflow question:
 * http://stackoverflow.com/questions/29775893/watermark-in-a-pdf-with-itext
 */
package sandbox.stamper;
 
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.GrayColor;
import com.itextpdf.text.pdf.PdfArray;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfNumber;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
 
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import sandbox.WrapToTest;
 
@WrapToTest
public class AddExtraMargin {
 
    public static final String SRC = "resources/pdfs/primes.pdf";
    public static final String DEST = "results/stamper/primes_extra_margin.pdf";
 
    public static void main(String[] args) throws IOException, DocumentException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new AddExtraMargin().manipulatePdf(SRC, DEST);
    }
 
    public void manipulatePdf(String src, String dest) throws IOException, DocumentException {
        PdfReader reader = new PdfReader(src);
        int n = reader.getNumberOfPages();
        PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
        // properties
        PdfContentByte over;
        PdfDictionary pageDict;
        PdfArray mediabox;
        float llx, lly, ury;
        // loop over every page
        for (int i = 1; i <= n; i++) {
            pageDict = reader.getPageN(i);
            mediabox = pageDict.getAsArray(PdfName.MEDIABOX);
            llx = mediabox.getAsNumber(0).floatValue();
            lly = mediabox.getAsNumber(1).floatValue();
            ury = mediabox.getAsNumber(3).floatValue();
            mediabox.set(0, new PdfNumber(llx - 36));
            over = stamper.getOverContent(i);
            over.saveState();
            over.setColorFill(new GrayColor(0.5f));
            over.rectangle(llx - 36, lly, 36, ury - llx);
            over.fill();
            over.restoreState();
        }
        stamper.close();
        reader.close();
    }
}


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