One-click option to protect a PDF with a password
1. Open the PDF in Acrobat DC.
2. Choose File > Protect Using Password. Alternatively, you can choose Tools > Protect > Protect Using Password.
3. Select if you want to set the password for Viewing or Editing the PDF.
4. Type and retype your password. The password strength is displayed next to your password to indicate whether the chosen password is weak, medium, strong, or best.
5. Click Apply. Acrobat displays a confirmation message that the file was successfully protected using a password.
