Word Encryption for DOCX in C# and VB.NET

DOCX encryption enables you to securely protect the content of your Word document from unwanted viewers by encrypting it with a password. The passwords are case-sensitive and they can't be empty.

You can use the DocxLoadOptions.IsEncrypted static methods to check if a Word document is encrypted.

Location of encryption option in Microsoft Word application

To read an encrypted Word document, you'll need to provide a valid password by using the DocxLoadOptions.Password property. In case of an invalid password, GemBox.Document won't be able to decrypt the file and thus a SecurityException will occur when trying to load it.

To write an encrypted Word document, you'll need to provide a password by using the DocxSaveOptions.Password property.

The following example shows how you can load an encrypted DOCX file and save it as an encrypted DOCX file with a different password in C# and VB.NET.

Encrypting and decrypting Word file of DOCX format in C# and VB.NET
Screenshot of Word document's encryption
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using GemBox.Document;

class Program
{
    static void Main()
    {
        // If using Professional version, put your serial key below.
        ComponentInfo.SetLicense("FREE-LIMITED-KEY");

        string inputPassword = "%InputPassword%";
        string outputPassword = "%OutputPassword%";

        var document = DocumentModel.Load("%InputFileName%",
            new DocxLoadOptions() { Password = inputPassword });

        document.Save("DOCX Encryption Output.docx",
            new DocxSaveOptions() { Password = outputPassword });
    }
}
Imports GemBox.Document

Module Program

    Sub Main()

        ' If using Professional version, put your serial key below.
        ComponentInfo.SetLicense("FREE-LIMITED-KEY")

        Dim inputPassword As String = "%InputPassword%"
        Dim outputPassword As String = "%OutputPassword%"

        Dim document = DocumentModel.Load("%InputFileName%",
            New DocxLoadOptions With {.Password = inputPassword})

        document.Save("DOCX Encryption Output.docx",
            New DocxSaveOptions With {.Password = outputPassword})

    End Sub
End Module

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