GroupDocs.Signature for Java
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.