How to lock pdf file

download primopdf software and install on your PC

Open the pdf file you want to lock, go to "File " > "Print "

If installed successfully, you should see "PrimoPDF" in the list of printers.

Select it and click "Print "

Once the software opens,

click on "Change" next to "PDF Security" as seen in screenshot below :

Tick the "Open Password" and "Permissions"

check boxes and set your security options as desired.

Click "OK" when you are done with the settings.

Click "Create PDF" to create the file.
Save to your desired location on your PC.

Open it and you should be prompted to enter a password as seen below:
That's all.

You can also use PDFMate free pdf merger software and if you a Mac user, you can lock pdf file with a password on your Macbook by making use of "Preview ".

It offers similar support and PDF encryption.

Just "export", check the "encrypt " box and set your password.

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