APIs to view, convert, annotate, compare, sign, assemble, and search documents in your .NET or Java applications. Free 30-day trial. It is composed of:

GroupDocs.Viewer is a fast, powerful, and high-quality file and document viewer API which allows you to display over 140 file formats. GroupDocs.Annotation allows programmers to develop their applications with the capability to annotate text or images in a document. GroupDocs.Conversion, advanced document conversion API developed to convert document formats. GroupDocs.Comparison, document difference checker API to compare both contents as well as text styles. GroupDocs.Signature, with this API you'll be able to easily add different types of signatures like text, image, or digital signatures on electronic documents. GroupDocs.Assembly, document automation, and reports generation API designed to create custom documents from templates. GroupDocs.Metadata, access, and manipulation API to read, edit, replace, and remove metadata of varied document types. GroupDocs.Search, document search APIs for advanced querying with indexing features. GroupDocs.Parser, text extractor API that supports the extraction of raw, formatted & structured text and metadata from supported file formats. GroupDocs.Watermark is a document watermarking API to add, search, and remove the watermark from multiple file formats. GroupDocs.Editor loads document of supported file format converts it to HTML, pushes HTML to external HTML editor, saves the HTML to its original file format. GroupDocs.Merger is an API to merge, split, readjust, swap, trim, and remove a single page or a collection of pages, slides, or diagrams. GroupDocs.Reduction API is accustomed to protect or remove any confidential information from Word, Excel, PowerPoint, Images, and PDF documents using text, metadata, and annotation redaction types. GroupDocs.Classification is a raw text and documents classification API for .NET applications.