Convert PDF to Image and Convert Image to PDF in Java

By using Free Spire.PDF for Java, we can easily convert any specific page of PDF document to BMP and Metafile image in JAVA applications, and it also supports converting multiple image formats such as BMP, JPEG, GIF, PNG, TIFF and ICO to PDF. In this article, I’ll show you how to convert PDF to .png image and convert .jpg image to PDF for example.

Add Spire.Pdf.jar as a dependency

Before running codes, the thing you need to do is adding Spire.Pdf.jar to IDEA as a dependency. There are two methods to do it. One is that download Free Spire.PDF for Java package from the E-iceblue website, unzip it and manually add Spire.Pdf.jar in the “lib” folder to IDEA. The other is that installing Spire.PDF for Java from Maven repository. Create a Maven program, write down the following code snippets in your pom.xml file, and then click the button “Import Changes”.

<repositories>

        <repository>

            <id>com.e-iceblue</id>

            <name>e-iceblue</name>

            <url>http://repo.e-iceblue.com/nexus/content/groups/public/</url>

        </repository>

</repositories>

<dependencies>

    <dependency>

        <groupId>e-iceblue</groupId>

        <artifactId>spire.pdf.free</artifactId>

        <version>3.9.0</version>

    </dependency>

</dependencies>

Using the code
Convert PDF to Image
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import com.spire.pdf.PdfDocument;

import javax.imageio.ImageIO;


public class ToImage {

    public static void main(String[] args) throws IOException
{

        //load the sample PDF

        PdfDocument doc = new PdfDocument();

        doc.loadFromFile("C:\\Users\\Test1\\Desktop\\Sample.pdf");

        //save every page of PDF document to .png image

        BufferedImage image;

        for (int i = 0; i < doc.getPages().getCount(); i++) {

            image = doc.saveAsImage(i);

            File file = new File( String.format("output/ToImage-img-%d.png", i));

            ImageIO.write(image, "PNG", file);

        }

        doc.close();

    }

}
Output

Convert Image to PDF
There are three steps in all to realize the purpose of converting Image to PDF. 
Step 1: Create a new PDF file and add a page in it.
Step 2: Load an image in any format, such as jpg, bmp, png, gif, tiff and ico. A .jpg image is loaded and its location
is set in this method.
Step 3: Save the image to PDF file in a specific path.
import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.graphics.PdfImage;
import java.awt.geom.Rectangle2D;

public class ImageToPDF {

    public static void main(String[] args) {

        //Create a PdfDocument instance

        PdfDocument pdf = new PdfDocument();

        //Add a page

        PdfPageBase page = pdf.getPages().add();

        //Load the image

        PdfImage image = PdfImage.fromFile("C:\\Users\\Test1\\Desktop\\Image.jpg");

        //Draw the image to the specific rectangular area of the page

        double widthFitRate = image.getPhysicalDimension().getWidth() / page.getCanvas().getClientSize().getWidth();

        double heightFitRate = image.getPhysicalDimension().getHeight() / page.getCanvas().getClientSize().getHeight();

        double fitRate = Math.max(widthFitRate, heightFitRate);

        double fitWidth = image.getPhysicalDimension().getWidth() / fitRate;

        double fitHeight = image.getPhysicalDimension().getHeight() / fitRate;

        page.getCanvas().drawImage(image, new Rectangle2D.Double(0, 0, fitWidth, fitHeight));

        //Save the resulting document

        pdf.saveToFile("output/ConvertImageToPDF.pdf");

    }

}
Output


Conclusion
In addition to converting PDF to Image or Image to PDF, Free Spire.PDF for Java supports converting 
PDF to XPS, SVG, Excel, Word, HTML and PDF/A or convert XPS, SVG, HTML to PDF in high 
quality. You can find relevant tutorials from the link and please take a note on our Forum if there is any 
question.