Protect PowerPoint in C# | .NET PowerPoint Library

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Overview

Protect your sensitive information and control document access with ease. The Syncfusion .NET PowerPoint Library lets you programmatically encrypt and decrypt presentations in C# without relying on Microsoft PowerPoint or interop dependencies.

How to encrypt a PowerPoint presentation with a password in C#

Install NuGet package: Install the Syncfusion.Presentation.Net.Core NuGet package in your project.
Open presentation: Create a FileStream object to represent the input presentation.
Load in .NET PowerPoint Library: Create an IPresentation object by passing the FileStream object.
Encrypt with password: Call the Encrypt method of the IPresentation object by passing the password.
Save presentation: Save the IPresentation object to the FileStream object.

Here is an example of how to encrypt a presentation in C# using the Syncfusion .NET PowerPoint Library.

c#
//Open an existing presentation.
using FileStream inputStream = new FileStream("Template.pptx", FileMode.Open, FileAccess.Read);
using IPresentation presentation = Presentation.Open(inputStream);

//Encrypt the presentation with a password.
presentation.Encrypt("password");

//Save the presentation.
using FileStream outputStream = new FileStream("Sample.pptx", FileMode.Create, FileAccess.ReadWrite);
presentation.Save(outputStream);

How to decrypt a protected PowerPoint presentation in C#

Install NuGet package: Install the Syncfusion.Presentation.Net.Core NuGet package in your project.
Open password-protected presentation: Create a FileStream object to represent the input presentation.
Load in .NET PowerPoint Library: Create an IPresentation object by passing the FileStream object.
Decrypt presentation: Call the RemoveEncryption * method of the *IPresentation object.
Save presentation: Save the IPresentation object to the FileStream object.

Here is an example of how to decrypt a password-protected presentation in C# using the Syncfusion .NET PowerPoint Library.

c#
//Open an existing presentation.
using FileStream inputStream = new FileStream("Template.pptx", FileMode.Open, FileAccess.Read);
using IPresentation presentation = Presentation.Open(inputStream, "password");

//Decrypt the presentation.
presentation.RemoveEncryption();

//Save the presentation.
using FileStream outputStream = new FileStream("Sample.pptx", FileMode.Create, FileAccess.ReadWrite);
presentation.Save(outputStream);

Protect options

Restrict editing

Protect a PowerPoint presentation with a password to restrict unauthorized editing.

Here is an example of how to restrict editing for presentations in C# using the Syncfusion .NET PowerPoint Library.

c#
//Open an existing presentation.
using FileStream inputStream = new FileStream("Template.pptx", FileMode.Open, FileAccess.Read);
using IPresentation presentation = Presentation.Open(inputStream);

//Protect the presentation with a password from unauthorized editing.
presentation.SetWriteProtection("password");

//Save the presentation.
using FileStream outputStream = new FileStream("Sample.pptx", FileMode.Create, FileAccess.ReadWrite);
presentation.Save(outputStream);

Mark as final

Make the PowerPoint presentation read-only to prevent readers from making inadvertent changes.

Here is an example of how to mark a presentation as final in C# using the Syncfusion .NET PowerPoint Library.

c#
//Open an existing presentation.
using FileStream inputStream = new FileStream("Template.pptx", FileMode.Open, FileAccess.Read);
using IPresentation presentation = Presentation.Open(inputStream);

//Mark the presentation as final.
presentation.Final = true;

//Saves the presentation.
using FileStream outputStream = new FileStream("Sample.pptx", FileMode.Create, FileAccess.ReadWrite);
presentation.Save(outputStream);