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In this article, we will learn how to merge PDF files into a single document using Java. Merging PDF files is a common task in the IT industry and is often required in various applications such as document management systems, reporting and more.
In this article, we will demonstrate how to merge multiple PDF documents using IronPDF for Java. We will go through the process of setting up the environment, importing the library, reading the input files and merging them into a single document. By the end of this article, you will know exactly how to use IronPDF for Java to merge PDF files.
IronPDF for Java is a powerful library that allows developers to create new PDF documents from scratch and convert various file formats to PDF documents. It also provides the ability to merge multiple PDF files into a single document.
IronPDF for Java is easy to use and has a simple and intuitive API that makes it easy for developers to create PDF files. It also supports various features like text and image editing, form filling and much more.
Before we begin, there are a few prerequisites that must be met to carry out the PDF creation process.
If all requirements are met, the installation of IronPDF for Java is quite simple and straightforward, even for Java novices.
For this article, we will use JetBrain's IntelliJ IDEA to install and run samples.
First, open JetBrains IntelliJ IDEA and create a new Maven project.
A new window will appear. Enter the name of the project and click on finish.
After you click Finish, a new project will open to a pom.xml. We will use this to add Maven dependencies of IronPDF for Java.
Add the following dependencies in the pom.xml file or you can download the JAR file from the following link.
<dependency>
<groupId>com.ironsoftware</groupId>
<artifactId>com.ironsoftware</artifactId>
<version>2024.3.1</version>
</dependency>
Once you placed the dependencies in the pom.xml file, a small icon will appear in the right top corner of the file.
Click on this icon to install the Maven dependencies of IronPDF for Java. This will only take a few minutes depending on your internet connection.
IronPDF allows you to merge multiple PDF documents into a single PDF document using a Java program. IronPDF provides several ways to merge PDF documents:
import com.ironsoftware.ironpdf.PdfDocument;
import java.io.IOException;
import java.nio.file.Paths;
public class main {
public static void main(String[] args) throws IOException {
String htmlA = "<p> [PDF_1] </p>"
+ "<p> Hi this the the first PDF </p>";
String htmlB = "<p> [PDF_2] </p>"
+ "<p> This the 2nd PDF </p>";
PdfDocument pdfA = PdfDocument.renderHtmlAsPdf(htmlA);
PdfDocument pdfB = PdfDocument.renderHtmlAsPdf(htmlB);
PdfDocument merged = PdfDocument.merge(pdfA, pdfB);
merged.saveAs(Paths.get("assets/merged.pdf"));
}
}
IronPDF allows you to merge existing PDF files into one common PDF file. Just specify the list of PDF input files. IronPDF will merge all PDF files into a single PDF document and save it to the destination file. The output will contain the result of the successfully merged PDF files.
import com.ironsoftware.ironpdf.PdfDocument;
import java.io.IOException;
import java.nio.file.Paths;
public class main {
public static void main(String[] args) throws IOException {
PdfDocument pdfA = PdfDocument.fromFile(Paths.get("assets/1.pdf"));
PdfDocument pdfB = PdfDocument.fromFile(Paths.get("assets/2.pdf"));
PdfDocument merged = PdfDocument.merge(pdfA, pdfB);
merged.saveAs(Paths.get("assets/merged.pdf"));
}
}
You can easily merge more than two PDF files using IronPDF for Java.
import com.ironsoftware.ironpdf.PdfDocument;
import java.io.IOException;
import java.nio.file.Paths;
public class main {
public static void main(String[] args) throws IOException {
List<PdfDocument> pdfList = new ArrayList<>();
pdfList.add(PdfDocument.fromFile(Paths.get("assets/1.pdf")));
pdfList.add(PdfDocument.fromFile(Paths.get("assets/2.pdf"));
pdfList.add(PdfDocument.fromFile(Paths.get("assets/3.pdf"));
PdfDocument merged = PdfDocument.merge(pdfList);
merged.saveAs(Paths.get("assets/merged.pdf"));
}
}
This article covers how to merge multiple PDF files using Java and the IronPDF library. By following the steps outlined in this article, you will be able to set up the environment, import the library, read the input files, and merge them into a single document.
For more information about merging two or more PDF files in Java and for similar tutorials on how to create and format PDFs using Java, read the Documentation pages.
IronPDF for Java is free for development purposes but requires a license for commercial use.
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