GroupDocs.Signature Cloud is a REST API to create, verify, search, update and delete different type of Signatures objects to documents in the cloud by performing a wide variety of signature options you can wish to put on a document in the cloud, verify document and search Signatures in it.
Note Summary there are five types of supported Signature type you can operate with.
Text Signature - simple text label with different appearance settings and ability to align the signature location on page area, set font and colors, same as put on any or all pages of a document Image Signature - image signature with amount of filters and appearance settings, like Opacity, gray scale filter, brightness, contracts etc Barcode Signature - put different Barcode encode types on Document pages with lot of additional settings, appearance options and alignment properties QR-Code Signature - put different QR-Code encode types on Document pages with a lot of additional settings, appearance options and alignment properties Digital Signature - put digital signatures like certificate files (PFX, CRT format) on Document or separate pages (for PDF only) with a lot of additional settings, appearance options and alignment properties Stamp Signature - put Stamp generated images on Document pages Our GroupDocs....Metadata Product Solution GroupDocs...