Encrypt and Decrypt Word Documents Using the Syncfusion .NET Word Library

Protect your sensitive information and control document access with ease. The Syncfusion^® .NET Word Library enables you to programmatically encrypt and decrypt Word documents in C#, all without relying on Microsoft Word or interop dependencies.

Watch this video to learn how to encrypt and decrypt Word documents using the Syncfusion .NET Word Library.

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Encrypt and decrypt Word document using C#

Learn how to encrypt and decrypt Word documents programmatically using C# with the Syncfusion .NET Word Library. This guide demonstrates password-based protection to secure documents and remove encryption to make them accessible.

Step 1: Create a new project

Start by creating a new C# Console Application project.

Step 2: Install the NuGet package

Add the Syncfusion.DocIO.Net.Core package to your project from NuGet.org.

Step 3: Add required namespaces to encrypt and decrypt Word document

Add the following namespaces to your Program.cs file:

c#
using Syncfusion.DocIO;
using Syncfusion.DocIO.DLS;
using System.IO;

Step 4: Open a Word document

Open an existing Word document from a file stream.

c#
FileStream fileStream = new FileStream(Path.GetFullPath(@"Data/Template.docx"), FileMode.Open, FileAccess.ReadWrite)
//Open the template document
WordDocument document = new WordDocument(fileStream, FormatType.Docx);

Step 5: Encrypt the Word document

Apply password-based encryption to protect the Word document.

Run

c#
//Encrypt the Word document with a password
document.EncryptDocument("syncfusion");

Step 6: Save the encrypted Word document

Save the encrypted Word document to a file stream.

c#
//Create file stream
FileStream outputStream = new FileStream(Path.GetFullPath(@"Output/Result.docx"), FileMode.Create, FileAccess.ReadWrite)
//Save the Word document to file stream
document.Save(outputStream, FormatType.Docx);
document.Close();
fileStream.Close();
outputStream.Close();

Step 7: Open an encrypted Word document

Open an encrypted Word document using the password to access its contents.

c#
FileStream fileStream = new FileStream(Path.GetFullPath(@"Data/Template.docx"), FileMode.Open, FileAccess.ReadWrite);
//Open an encrypted Word document
WordDocument document = new WordDocument(fileStream, FormatType.Docx, "syncfusion");

Step 8: Decrypt the Word document

Remove the encryption from the Word document to make it accessible.

Run

c#
//Remove encryption in Word document
document.RemoveEncryption();

Step 9: Save the decrypted Word document

Save the decrypted Word document to a file stream.

c#
//Create file stream
FileStream outputStream = new FileStream(Path.GetFullPath(@"Output/Result.docx"), FileMode.Create, FileAccess.ReadWrite);
//Save the Word document to file stream
document.Save(outputStream, FormatType.Docx);
document.Close();
fileStream.Close();
outputStream.Close();