Remove Encryption on Password-Protected PowerPoint File

Everytime we try to open a password-protected PowerPoint file, we will then be prompted to enter the password. This can be really a bothering thing itself. But things get worse if we forget the password. To avoid this situation from being occurred, we can choose to remove the encryption if the PowerPoint file is not necessarily protected. In this article, I’ll introduce you how to remove encryption on password-protected PowerPoint file using Spire.Presentation.

In the classes of Spire.Presentation, you can invoke Presentation.LoadFromFile(string file, string password) method to load the file that you want to remove protection, then you're entitled to remove encryption by calling Presentation.RemoveEncryption() method. More details:

Step 1: Create Presentation instance and load file.

Presentation presentation = new Presentation();
presentation.LoadFromFile("Presentation1.pptx", "test");

Step 2: Remove encryption.

presentation.RemoveEncryption();

Step 3: Save and launch the file.

presentation.SaveToFile("result.pptx", FileFormat.Pptx2010);
System.Diagnostics.Process.Start("result.pptx");

Effect Screenshot:

Remove Encryption on Password-Protected PowerPoint File

Full Code:

[C#]

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Spire.Presentation;

namespace RemoveProtect
{
    class Program
    {
        static void Main(string[] args)
        {
            // create Presentation instance and load file
            Presentation presentation = new Presentation();
            presentation.LoadFromFile("Presentation1.pptx", "test");

            //remove encryption
            presentation.RemoveEncryption();

            //save the file
            presentation.SaveToFile("result.pptx", FileFormat.Pptx2010);
            System.Diagnostics.Process.Start("result.pptx");
        }
    }
}

[VB.NET]

Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports System.Text
Imports Spire.Presentation
 
Namespace RemoveProtect
    Class Program
        Shared  Sub Main(ByVal args() As String)
            ' create Presentation instance and load file
            Dim presentation As Presentation =  New Presentation() 
            presentation.LoadFromFile("Presentation1.pptx", "test")
 
            'remove encryption
            presentation.RemoveEncryption()
 
            'save the file
            presentation.SaveToFile("result.pptx", FileFormat.Pptx2010)
            System.Diagnostics.Process.Start("result.pptx")
        End Sub
    End Class
End Namespace

Remove Encryption on Password-Protected PowerPoint File

See Also