Password Protect Word Documents using C#. Add, Remove, and Change Password using .NET API

readme.md

Related blog post: Lock & Unlock Word Documents using C#

AddPasswordToDoc.cs

/*
 * Password Protect Word Documents using C#
 */
string filePath = @"path/document.docx";

AddPasswordOptions addOptions = new AddPasswordOptions("mySECRETpassWORD");

using (Merger merger = new Merger(filePath))
{
    merger.AddPassword(addOptions);
    merger.Save(@"path/protected-document.docx");
}

ChangeDocPassword.cs

/*
 * Change password of the protected DOC/DOCX documents in C#
 */
string filePath = @"path/protected-document.docx";

LoadOptions loadOptions = new LoadOptions("mySECRETpassWORD");
UpdatePasswordOptions updateOptions = new UpdatePasswordOptions("TOPSECRET_pa22WORD");

using (Merger merger = new Merger(filePath, loadOptions))
{
    merger.UpdatePassword(updateOptions);
    merger.Save(@"path/pwd-changed-document.docx");
}

RemoveDocPassword.cs

/*
 * Remove password from Word document using C#
 */
string filePath = @"path/protected-document.docx";

LoadOptions loadOptions = new LoadOptions("mySECRETpassWORD");

using (Merger merger = new Merger(filePath, loadOptions))
{
    merger.RemovePassword();
    merger.Save(@"path/no-pwd-document.docx");
}