How to Password Protect a PDF Document Using MS Word 2016?br br Step 1: Open your PDF Document in MS Word.br br Step 2: Click on 'File,' and then click on 'Save As.' Click on 'Browse.'br br Step 3: Now, select 'pdf' in 'Save as type.'br br Step 4: Give the name to your PDF Document. After that, Select the destination where you want to save it.br br Step 5: Click on 'Óptions' button. After that, Click on 'Encrypt the document with a password' to select it.br br Step 6: Click on 'ok' button.br br Step 7: Give it a password, and then Reenter the password. Click on 'ok' button, and then click on 'save' button.