Finding a free utility to unlock pdf documents is just a matter of single search on Google. On the other hand, Google does not throw up impressive results if you search for something like how to password protect a pdf file. Most of the results points you to the paid utilities.

Here is a software and step by step instructions you can use to password protect your pdf document for free:

The utility is  Pdf creator from PrimoPDF

  1. Once you download the PDF creator and install it. It will appear in the print dropdown. (File > Print). Click OK to convert any document to PDF. pdf-converter
  2. You will see the screen shown below. Click on Security button. password-protect-pdf
  3. On the next window, enter the ‘Password to Open’ which will allow you to password protect your pdf . You can also enter ‘Password to Change Security’. This option allows you to change security settings that:
    1. Allow users to print my PDF
    2. Allow users to copy text and graphics from my PDF
    3. Allow users to add comments
    4. Allow users to change my PDF, including editing text and adding or removing pages

    prmio-pdf-secirity

  4. Click on OK in the screen shown above. Click OK again on the last screen.
  5. Your free password protected PDF is ready. Enjoy!

Also see the cool utilities from A-PDF. This company has come up with various solutions to perform operations on PDF files. Some of them are  Batch unsecure PDF files, Put page numbers on bottom of PDF, Insert date time stamp to a Acrobat PDF, Split PDFs at pages matching specific text pattern. Check them out.

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