Note: This feature might not be available on all editions of HelpNDoc. Check HelpNDoc's feature comparison page to learn more.

PDF documents generated by HelpNDoc can be encrypted using strong encryption algorithms. HelpNDoc supports the following PDF encryption algorithms: RC4 40 bits, RC4 128 bits, AES 128 bits, AES 256 bits with hardened key generation.

Access the "Encrypt document" panel

Each PDF build can be encrypted independently. To access the "Encrypt document" panel:

  • From HelpNDoc's "File" menu, click the top part of the "Generate help" button to show the "Generate documentation" window
  • Select a PDF build in the build list
  • Click "Customize" if the build customization tabs are not visible yet
  • Navigate to the "Encrypt document" tab

Encrypt a PDF document

Check the "Encrypt Document" checkbox to enable document encryption for this build. Available options:

Option name


Encryption algorithm

Specify the encryption algorithm to use for document encryption

Encrypt Metadata

Encrypts document metadata if checked

Owner password

Password for the document's owner. Owner has all permissions

User password

Password for the document's user. Might have limited permissions

User permissions / Printing

Specify if the end user can print the document: disabled, low resolution only, or high resolution 

User permissions / Copying

Specify if the end user can copy parts of the document: disabled, text access for accessibility settings, allowed

User permissions / Modifying

Specify if the end user can modify, annotate or assemble the document