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How to secure PDF file with passwords

Syncfusion Essential PDF is a .NET PDF library used to create, read, and edit PDF documents. Using this library, you can protect the PDF document using encryption and set permission to the PDF document operations like printing, editing, and copy content in C# and VB.NET. The Essential PDF supports basic to advanced encryption standards.

  • RC4 (Rivest Cipher 4) 40-bit
  • RC4 128-bit
  • AES 128-bit
  • AES 256-bit Revision 5
  • AES 256-bit Revision 6 (PDF 2.0)

 Steps to create secured PDF programmatically:

  1. Create a new C# console application project.

  1. Install the Syncfusion.Pdf.WinForms NuGet package as reference to your .NET Framework application from NuGet.org.


  1. Include the following namespace in the Program.cs file.



  1. Use the following code snippet to create secured PDF and encrypt it with both owner and user passwords.



Download the work sample from CreateSecurePDFSample.Zip.

By executing the program, you will get the PDF document’s security settings as follows.

Take a moment to peruse the documentation, where you can  find other options like protect an existing PDF document, change the  password, change the permission, remove the password of the PDF document and the features like digitally sign a PDF file, and adding a timestamp in digital signature, with code examples.

Refer here to explore the rich set of Syncfusion Essential PDF features.

An online sample link to secure PDF file with passwords.


Starting with v16.2.0.x, if you reference Syncfusion assemblies from trial setup or from the NuGet feed, include a license key in your projects. Refer to link to learn about generating and registering Syncfusion license key in your application to use the components without trail message.





Article ID: Published Date: Last Revised Date: Platform: Control:
9113 08/07/2018 09/24/2018 WinForms PDF
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