How to Password Protect PDFs in Postdoc (Windows) In case of password issues in the Adobe Bridge, try the following Postdoc solution Postdoc password-protection — Adobe.com Help Center (Windows) How to Password-Protect PDF Document Open a document in Preview on Mac; or Open a PDF in Preview > Acrobat Reader, and do one of the following: Open the PDF in an Adobe software and select Tools > Protected Docs > Password-Protected PDF How to Create Passwords in Adobe Acrobat Choose File > Add File: Select a file > Select File: Choose a password How to Password-Protect PDFs on Desktop Computers The following steps will help you to make a PDF password-protected in Microsoft Word, Microsoft Excel and Microsoft PowerPoint. On your desktop, open Word, Excel or PowerPoint, select the toolbar in the top right corner and then choose Tools > Passwords. If you want to change the password for all files on your hard drive, select File > Options > Advanced, then click the Advanced button in the Passwords box and select the option to protect file and folder passwords as well. Click OK. In the Options Box for the Passwords list, choose the setting that you want to use for each file and folder password. Check the box to turn on the automatic setting, then click OK. Press the OK button in the Passwords window to close the dialog box. The change will be reflected in the options for each of your documents. When you're finished with a document, choose File > Close to return to the Word, Excel or PowerPoint preferences panel. Note: If you are on a Windows machine, be sure to check the box in the Word, Excel or PowerPoint preferences panel to use automatic password protection. How to password-protect PDF Documents on Mac If you want to password-protect a PDF document in QuickTime Player, go to Edit > Preferences > Account and change the password or choose a password that is not visible: Select a file, press Command + T, and enter your password, which should appear within your browser window. How To Create Passwords in Microsoft Office 2010 If you are using Microsoft Office, you can create password protection for your PDF files. To password protect a document in Microsoft Office, open the document, then go to File > Options or choose Edit > Preferences.