How to add passwords to pdf documents without PDF reader installed?

The pdf encryption software: Wowtron PDF Encryption can Encrypt or Change security options to PDF documents. Protect PDF files with passwords and prevent PDF files from being printed, copied, changed, filled, extracted, signed, assembled or merged. Supports Adobe Standard 40-bit Encryption and Adobe Advanced 128-bit Encryption, it could also supports the more safer security method AES 128-bit Encryption and AES 256-bit Encryption.  You can set User Password, Owner Password, Encryption level in 40, 128 or 256 bit, and Security Options (Printing, Modify Contents, Copy, Modify Annotations, Fill In, Screen Readers).

Here are the steps on how to Encrypt and Change security options to PDF file:

  1. Select a PDF file that you want to add password or change security options.
  2. ThePassword and Security Options dialog box comes up:


  1. Save or Save as the encrypted PDF file to output.
  2. You could launch the encrypted PDF file by the hot-keys at once if you have installed Adobe Reader or the others PDF readers.

It’s easily add password to pdf documents showed in above steps.


User Password is used to open the PDF document

Owner Password is used to change security settings


Encryption Level:

40-bit RC4, 128-bit RC4, AES 128-bit, AES 256-bit


Security Options:

Allow Printing:  Allow to print the PDF document

Allow Copying:  Allow to copy or extract

Modify the Content:  Allow to modify

Modify the Annotations:  Allow to add or modify annotations or form fields

Fill in the Content:  Allow to input form field and signature


We also provide the advanced version which do all of this in batches, contact us to get it: .