Aspose.Pdf.Kit is a .NET component for editing existing PDF files. You can add/remove digital signatures or encrypt/decrypt a PDF. It supports many useful features like; PDF stamp creation, adding CJK font in form field, AcroForm, adding watermark or logo, extracting or adding images & text, adding bookmarks, appending pages and converting PDF file to TIFF, BMP, PNG & JPG image formats. It enables you to concatenate PDF files and allows adding or setting XMP Metadata to an existing PDF.