Bethan Palmer Bethan is a Java developer and a Java Champion. She has spoken at conferences including JavaOne/Code One, DevFest and NetBeans days. She has a degree in English Literature.

How to convert an image to a PDF in Java

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In a previous post I looked at why you might want to convert a PDF file to an image (you can use JPedal to do this). This time I will look at doing the opposite, and explain why and how to convert an image to a PDF file.

Why convert images to PDF?

Some images can be displayed in the browser, and do not require PDF display tools to be viewed. Converting images to PDF files allows the display of Tiff and other non-support image types and makes them easier to handle. PDF files can be altered and extra content can be added to them. Converting an image to a PDF will also reduce the size of the file.

The PDF file format is very complex and we generally recommend using existing tools rather than trying to build your own from scratch (if you really want to try this we have a series of articles on how to do this). We recommend you use a Java library. There are lots of Open Source and Commercial Java libraries and we have 2 examples below.

1. iText (Open source library)

One way to convert an image to a PDF in Java is to use iText. iText is a PDF generation and manipulation tool for Java. It allows you to create a new PDF document and then add an existing image to that document.

You can find example code for adding an image to a PDF document using iText here.

2. JDeli (Commercial library)

Another way to convert an image to a PDF in Java is to use JDeli, our Java image library. JDeli can be used to read and write a large number of image file formats in Java. It can also be used to write an image into a PDF file.

How to convert an image file to a PDF file in JDeli

  1. Add JDeli to your class or module path. (link to the trial jar).
  2. Create a File (or InputStream) object for the Image input file.
    File imageFile = new File("C:\\path\\to\\pdf\\exampleImage.tif");
  3. Create a PdfEncoderOptions object for control over PDF file output.
    PdfEncoderOptions options = new PdfEncoderOptions();
  4. Create a File (or OutputStream) object
    File pdfFile = new File("C:\\path\\to\\pdf\\examplePDF.pdf");
  5. Pass input File object, Encoder Options and output File object into write method
    //create new PDF or append if PDF already exists
    JDeli.convert(imageFile, options, pdfFile);

If the image is a multi-page TIFF then JDeli will generate a multi-page PDF file, with as many images as the TIFF contains.

How to convert a Java BufferedImage to a PDF file in JDeli

  1. Add JDeli to your class or module path. (link to the trial jar).
  2. Create a File (or OutputStream) object
    File pdfFile = new File("C:\\path\\to\\pdf\\examplePDF.pdf");
  3. Create a PdfEncoderOptions object for control over PDF file output.
    PdfEncoderOptions options = new PdfEncoderOptions();
  4. Pass image and File object into write method
    //create new PDF or append if PDF already exists
    JDeli.write(bufferedImage, options, file);


Find out how to read and write images files in Java with JDeli:

Read: BufferedImage image = JDeli.read(streamOrFile);

Write: JDeli.write(myBufferedImage, OutputFormat.HEIC, outputStreamOrFile)

Learn more >>

Are you a Java Developer working with Image files?

Read and write images in Java with JDeli
Bethan Palmer Bethan is a Java developer and a Java Champion. She has spoken at conferences including JavaOne/Code One, DevFest and NetBeans days. She has a degree in English Literature.

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