GroupDocs.Comparison for Java is a flexible API that helps you develop document comparison applications. The difference checker and document merging API enable you to detect changes and difference in content, as well as text style between similar document formats. It supports the comparison of industry standard document formats such as PDF, HTML, Microsoft Office Word, Excel spreadsheets, PowerPoint presentations, Outlook emails, Visio diagrams, OpenDocument, AutoCAD and images. Using the change-tracking feature, the differences summary between source and target document will be presented in a comprehensive comparison document.