How to sign pdf, word/text file, jpeg/png/other types of images documents using digital signature in c#?

CodePudding user response：

You should be using a library package to add Digital signature to such documents. For example, to add a digital signature to PDF, you could use Aspose library, by adding its Nuget to your project. See this detailed article. Similarly, for docs like Word, you could the approach shown here.

CodePudding user response：

You may try Aspose .NET APIs that support digital signing of the documents (e.g. DOCX, XLSX, PDF, PPTX, etc.). See the documents/articles for different file formats on the feature with complete details and examples for your reference:

Working with Digital Signatures (Aspose.Words)

Assign and Validate Digital Signatures (Aspose.Cells)

Digitally sign PDF file (Aspose.PDF)

etc.

PS. I am working as Support developer/ Evangelist at Aspose.