How to set a user password for a pdf file using command line

A pdf user password is the password used to restrict the opening of a pdf. In Adobe Acrobat, the PDF user password is called the document open password. So, a user password is an open password.It only restricts the opening of a PDF file. The way to set a user password/open password of pdf using command line is easy and quick. Below is detailed operation on how to set a user password/open password of pdf by Advanced PDF Tools Command Line.

Step 1 click the following link to download Advanced PDF Tools

please unpack it when download is finished.

Step 2 launch the MS-DOS command prompt window. Because the command line is bound to be operated under the MS-DOS environment. The procedure is easy, and the following pictures will guide you.

1) click “start” and then go to “Run”

click "start" and then select "Run"

2) input cmd into the following


3) press “ok”, you will find MS-DOS command prompt window popping up

 command prompt

Step 3 input command line to set a user password for a pdf file

it goes below

pdftools.exe -i C:\*.pdf -o D:\*.pdf  -S userpwd=xux -S keylen=2


  • the option -i is to specify a pdf filename or a directory for input,
  • the option -o is to specify the pdf file name for output,
  • -S userpwd=xux to set a user password as xux
  • -S keylen=2 refers to 128 bit AES encryption (Acrobat 7 or higher)

when the input is done, press “enter” key, you will see

detailed operation in command prompt

Step 4 open the file to check if opening the file an open password is needed

output pdf file

and you can type the open password xux to open it

output pdf file

output pdf file

Now you are successful in setting an open password.

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