JPG to PDF in Java

README.md

Problem:

Scanned document stored as series of jpeg images and I needed a PDF. There are ways to accomplish this without code (print to PDF), but I needed to make the file a particular size and print to pdf made the single PDF larger than the combined size of the images.

Solution:

iText PDF library and Java program to create a PDF with the images. See more about iText here: http://developers.itextpdf.com/itext-java

See the code in Main.java. It started with a piece of code from nathan on stackoverflow with modifications to resize the image and to add multiple images (1 per page). See: http://stackoverflow.com/questions/15744454/how-to-convert-jpg-to-pdf-in-android-java

Maven dependency:

  <dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itextpdf</artifactId>
    <version>5.5.9</version>
  </dependency>

JpgToPdf.java

import com.itextpdf.text.Document;
import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PdfWriter;

import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;

public class JpgToPdf {
    public static void main(String arg[]) throws Exception {
        File root = new File("<folder containing images>");
        String outputFile = "output.pdf";
        List<String> files = new ArrayList<String>();
        files.add("page1.jpg");
        files.add("page2.jpg");
        
        Document document = new Document();
        PdfWriter.getInstance(document, new FileOutputStream(new File(root, outputFile)));
        document.open();
        for (String f : files) {
            document.newPage();
            Image image = Image.getInstance(new File(root, f).getAbsolutePath());
            image.setAbsolutePosition(0, 0);
            image.setBorderWidth(0);
            image.scaleAbsolute(PageSize.A4);
            document.add(image);
        }
        document.close();
    }
}