Word: How to Password Encrypt a PDF File You can use Microsoft Word to encrypt a PDF file. This quick guide shows you how to Password Encrypt a PDF File using Microsoft Word. 1. Open the File menu Once you have opened the document, click the file menu at the top-left of the screen. 2. Save As > Browse Click Save As  > Browse 3. Save as Type as PDF Click the drop down menu and choose PDF 4. Click the option button 5. Enable "Encrypt the document with a password" At the bottom of the windows, make sure the "encrypt the document with a password" is ticked. then click OK. 6. Enter a password Soon after you click OK, you will be requested to enter a password. 7. Save the PDF  Lastly, choose a location where you want this PDF + Password encrypted to be stored at.