GroupDocs.Total for Java includes the following document manipulation APIs for Java:

• GroupDocs.Annotation for Java provides a simple API that allows you to work with different types of annotations, which include: Text, Polyline, Area, Underline, Point, Watermark, Arrow, Ellipse, Text Replacement, Distance, Text Field, Resource Redaction etc. It also supports most popular documents formats including: PDF, HTML, Microsoft Office Word, Excel spreadsheets, PowerPoint presentations, Visio, Outlook emails, images, metafiles, CAD drawing and various other formats.
• GroupDocs.Assembly for Java helps you rapidly develop document automation and reporting applications that perform template creation and customization for supported file formats. Your Java applications will be able to assemble reports on the fly, by dynamically fetching data from data sources. The reports assembled and generated by GroupDocs.Assembly range from lists, tables, charts, images and more. You can configure and insert formatting properties of template elements dynamically. This enables you to create highly customizable reports and documents, of vast range of file formats, as per requirements.
• 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.
• GroupDocs.Conversion for Java helps developers build applications with file conversion functionality for more than 50 file formats. It supports business document conversion among documents, spreadsheets, slides, raster images, CAD, PSD, PDF and other file formats. With extra features such as, auto-detect file type, configure and place watermark, GroupDocs.Conversion for Java offers more than basic conversion.
• GroupDocs.Editor for Java enables you to edit documents using HTML. The API supports multiple document formats and can be integrated with any external, opensource or paid HTML editor. The API can load a document, convert it to HTML, provide the HTML to an external UI and then save the HTML to the original document after manipulation. It can also be used to generate different Microsoft Word files, OpenDocument Formats, XML and TXT documents.
• GroupDocs.Merger for Java is a document manipulation API that helps you merge, split, swap or remove document pages. The API provides protection by enabling or disabling passwords and allows developers to join PDF, Microsoft Word, Excel and Powerpoint documents.
• GroupDocs.Metadata for Java is an advanced metadata management API for manipulating information from documents, images, archives, torrents and various other file formats. Developers can easily view, modify, delete, extract, search, compare, replace and export metadata. It supports a variety popular business document formats such as PDF, Microsoft Word, Microsoft Excel spreadsheets, Microsoft PowerPoint presentations, Microsoft Outlook emails, Microsoft Project files, Microsoft Visio diagrams, Microsoft OneNote documents, images, AutoCAD files, Photoshop, audio and video files, OpenType fonts and metafiles.
• GroupDocs.Parser for Java is a text, image and metadata extractor API for applications that support parsing raw, structured and formatted text. It also allows you to retrieve metadata of supported file formats. GroupDocs.Parser for Java enables you to extract text and metadata from password protected files in all popular formats including word processing documents, Microsoft Excel spreadsheets, Microsoft PowerPoint presentations, Microsoft OneNote, PDF files and ZIP archives.
• GroupDocs.Redaction for Java lets developers remove sensitive data from popular file formats like Microsoft Word, Excel, PowerPoint, PDF and image. The redaction library offers a single format-independent interface to redact any type of classified information including social security numbers, medical information, financial, proprietary, legal or even trade details through text, metadata and annotation redaction types. It allows you to save the document in its original format and create a sanitized PDF document with raster images of original pages.
• GroupDocs.Search for Java enables users to perform text search functions. You can create and merge multiple indexes and use simple, boolean, regular expression (Regex), fuzzy and other types of queries to search through indexes. You can fetch information from files, documents, emails, and archives, as GroupDocs.Search for Java supports all popular file formats.
• GroupDocs.Signature for Java helps you develop applications with electronic signature functionality. You can sign digital documents without installing any external software. It supports the manipulation and management of various types of eSignatures such as image, barcode, QR-code, stamp, text, optical and metadata. All electronic business documents including Microsoft Office Word, PowerPoint presentations, Excel spreadsheets, images, and PDF files can be digitally signed.
• GroupDocs.Viewer for Java includes a set of APIs for building robust applications which natively raster documents and convert them into SVG, HTML, CSS and to other supported formats. It can also display password protected files and allow you to get document representation as HTML, images or PDF after rendering. The file viewer library is customizable, it allows you to render whole documents, or render partial documents to speed up the process. You can view pages, a specific cell range in a spreadsheet or even render an individual document layer in formats such as PDF and CAD. GroupDocs.Viewer for Java API allows you to render documents with/without annotation or comments for supported file formats.
• GroupDocs.Watermark for Java is a document watermarking API that can add, search for and remove watermarks in supported file formats. The API is a self-descriptive and straight-forward for integrating image and text watermarks within any PDF, Microsoft Office and multiple image document formats.