How to Protect my PDF Documents?

Acrobat Pro (version X or later) – Securing documents with password

You can restrict access to a PDF file by setting the Document Open Password.  Users have to enter the password to open the PDF file.

1) You may set your password in either ways shown below:

  • Open the PDF and choose Tools > Protection > Encrypt > Encrypt with Password.
  • You can also choose File > Properties and select the Security tab.
2) If you receive a prompt, click Yes to change the security.
3) Select the type of password to add, and then enter your own password in the corresponding field.
4) Click OK at the prompt to confirm each password, retype the appropriate password in the box and click OK.

Important: If you forget a password, you cannot recover it from the PDF. Consider keeping a backup copy of the PDF that isn’t password-protected.