In this step‑by‑step tutorial, you’ll discover how to compare PDF files using Java without installing any third‑party software. By invoking just a few API calls, you can swiftly add PDF comparison in Java to your projects. Below you’ll find complete instructions and a functional example for comparing PDF documents.

Steps to Compare PDF Files using Java

1. Install GroupDocs.Comparison for Java from the Maven repository
2. Add a reference to the essential classes for performing PDF comparison using Java
3. Create an instance of the Comparer class and pass the source PDF file to its constructor
4. Call the add method of the Comparer class and specify the target file path to compare PDF documents using Java
5. Finally, call the compare method and pass the resultant file path

We have created the above steps for comparing two PDF files for differences using Java. You just need to follow these points in a sequence to start developing the functionality to compare two PDF files in Java. Moreover, these instructions can be used on platforms including MS Windows, Linux, and Mac OS.

Code to Compare PDF Files using Java

In the example above you can see the Java code to compare two PDF files. We’ve provided a ready‑to‑run sample that performs the comparison of two PDF documents. To compare additional files, simply repeat step 4 in the code. The same approach also works with many other formats—including DOCX, XLSX, PPTX, VSDX, ODT, PNG, and more.