Aspose. Pdf. Kit is a .NET component for editing existing PDF files. You can also use it to add or remove digital signatures and encrypt or decrypt a PDF. It supports many useful features like PDF stamp creation, adding a CJK font in a form field, AcroForm, adding a watermark or logo, extracting or adding images and text, adding bookmarks, appending pages, and converting a PDF file to TIFF, BMP, PNG, and JPG image formats. It enables you to concatenate PDF files and allows adding or setting XMP Metadata to an existing PDF.
Apitron PDF Rasterizer is a .NET component that performs high-quality conversion from PDF files to images. It supports complex PDF content including text (with embedded, externally linked, standard, simple, and composite fonts), images, including masked ones, complex paths and fills, PDF Forms, annotation objects of various types, all blending modes, tiling patterns, shading patterns (function-based, axial, radial), transparency groups, masked content (stencil masks, colorkey masks, soft masks), all colorspaces specified by the PDF standard, Adobe Illustrator created files, PDF bookmarks and page navigation support, and text search and highlighting (including non-Latin alphabets).