EPUB (Electronic Publication) is one of the most popular formats for digital books and online publications. It delivers an open standard, flexible layout, and compatibility across various e-readers and devices. Developers in the publishing industry often need to combine multiple EPUB files into a seamless document. Manually merging EPUBs can be tedious and error-prone. Therefore, you can automate the merging process and boost efficiency. In this tutorial, you’ll discover how to merge EPUB files in Java using the REST API and build scalable, code-friendly solutions designed for modern developers managing digital content workflows.

Steps to Merge EPUB Files Using Java

1. Download the GroupDocs.Merger Cloud Java SDK and create a Java project
2. Obtain and set up your API credentials with the Configuration class
3. Initialize the DocumentApi class for merging EPUB files
4. Configure the source EPUB files to join using FileInfo and JoinItem
5. Define the merging options, including the output file with JoinOptions
6. Process the request to join two EPUB files with the join() method

Using these simple steps, you can easily integrate EPUB merging functionality into your Java applications. This approach guarantees high-quality results suitable for digital libraries, online bookstores, or educational eBook systems. Merging EPUB files programmatically with the Java REST API offers several advantages. You can merge eBooks, course materials, or magazine issues into a single file without dealing with complex manual operations. The cloud-based API enables secure, platform-independent merging, which is perfect for developers building Java applications for desktop, mobile, or web environments.

Code to Merge EPUB Files Using Java

GroupDocs.Merger Cloud Java SDK is a reliable outlet for developers seeking a robust option to merge EPUB files in Java apps. It delivers exceptional flexibility and ease of integration. Combining multiple EPUB documents programmatically into a single, well-structured eBook becomes seamless with the Java REST API. When automating content publishing, course compilation, or digital archiving, our Cloud API provides a powerful, cross-platform solution without complex dependencies.

Check out our detailed guide on Merging ODT Files Using the Java REST API to learn more about how to merge other document types efficiently.