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Free PDF Tools 3: Encrypt and Decrypt

This FREE PDF Tool can Encrypt or Decrypt 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.  You can set User Password, Owner Password, Encryption level in 40 or 128 bit, and Security Options (Printing, Modify Contents, Copy, Modify Annotations, Fill In, Screen Readers, Assembly and Degraded Printing).

Here are the steps on how to Encrypt and Decrypt PDF file:

1. Choose  Free PDF Tools > Encrypt and Decrypt

2. Select a PDF file that you want to add password or change security options.

3. The Password and Security Options dialog box comes up:


User Password is used to open the PDF document

Owner Password is used to change security settings

Encryption Level

  • 40-bit RC4: Acrobat 3.0 and Later
  • 128-bit RC4: Acrobat 5.0 and Later

Security Options:

  • Printing:  Allow to print
  • Modify Contents:  Allow to modify
  • Copy:  Allow to copy or extract
  • Modify Annotations: Allow to add or modify annotations or form fields
  • Fill In:  Allow to input form field and signature (128-bit RC4 only)
  • Screen Readers:  Allow to enable accessibility (128-bit RC4 only)
  • Assembly:  Allow to modify document assembly (128-bit RC4 only)
  • Degraded Printing:  Allow to print degraded mode (128-bit RC4 only)

Note: To disable printing, you have to uncheck both Printing and Degraded Printing.

4. Click Encrypt As or Decrypt As to have a new PDF file.  The new file may be launched automatically if you have installed Adobe Reader.

5. Do experiment with the options available to see which best suit your needs.  Click Close to finish.

Note: If you have problem to read your PDF into PDFill, open your PDF document inside Adobe Reader. Then, print into a new PDF using PDFill PDF Writer.

Batch (DOS) Command Support: (It is only available for the registered user of PDFill PDF Editor)

You can start a batch job in Windows by issuing the execution command directly from the MS-DOS command prompt window without opening the PDFill GUI.
Note: Please put "" on your file name with space. Make sure all command is in one line.

Encrypt a PDF
"C:\Program Files\PlotSoft\PDFill\PDFill.exe" ENCRYPT Input.pdf Output.pdf  -bit 40 -option 11110000 -userpassword str1 -ownerpassword str2

  • -bit 40: Encryption Level bit with 40 or 128.

  • -option 11110000: The option String consists of 8 bit of 0 or 1 for Printing, Modify Contents, Copy, Modify Annotations, Fill In, Screen Readers, Assembly, Degraded Printing.  11111111 means all checked and 00000000 means all unchecked.

  • -userpassword str1: String str1 is for User Password. If the user password is empty, don't use this option.

  • -ownerpassword str2: String str2 is for Owner Password. If the owner password is empty, don't use this option.

  • Example: "C:\Program Files\PlotSoft\PDFill\PDFill.exe" ENCRYPT "D:\Test\complaintform.pdf"   "D:\Test\output.pdf"  -bit 128  -option 00000000   -userpassword pdfill

Decrypt a PDF:
"C:\Program Files\PlotSoft\PDFill\PDFill.exe" DECRYPT Input.pdf Output.pdf  -password str

  • -password str: String str is Password to open this PDF if it is password-protected. If there is no password to open this PDF, don't use this option.

  • Example: "C:\Program Files\PlotSoft\PDFill\PDFill.exe" DECRYPT "D:\Test\visa.pdf"  "D:\Test\output.pdf"  -password 4567


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