Open your PDF file in the Preview app by double-clicking it.If you own a Mac, you can password protect documents natively in macOS. Method 3: Password Protect a PDF on a Mac Using Preview You can also restrict editing with a password if you so choose. Adobe Acrobat will give you an indication of how secure your password is. Check the Require a password to open document, then enter your password.If the user you are sending your PDF to doesn’t have a compatible version of Adobe, they won’t be able to decrypt it and open it. Depending on the version, you can enable support as far back as Adobe Acrobat 3.0. Choose the level of compatibility you want.Click in the Security Method list box, then choose Password Security.Click File > Properties, then select the Security tab.Launch Adobe Acrobat and open the PDF you would like to password-protect.

If you haven’t purchased a license for Adobe Acrobat, you can download a 30-day trial of Adobe Acrobat. If the document you want to password protect is already a PDF, you can use Adobe Acrobat to add a password. Method 2: Password Protect a PDF Using Adobe Acrobat

If you don’t have Microsoft Office installed, you can use this method with Microsoft 365 (Formerly Office 365). That’s it! When you open the document in your PDF viewer, you will be prompted to enter a password. Next, choose a password you don’t normally use if you plan to share the document with others. Please enter your password, then confirm it.Click the Options button, then check the option Encrypt the document with a password.Then Save as type list box, then select PDF.Open your Microsoft Office file in the respective application.When you encrypt and password protect a document you created using a Microsoft Office program (e.g., Excel, Word, PowerPoint), you can save it as a PDF that is also password protected. Password Protect PDF Files in Windows and macOS Method 1: Use Microsoft Office to Create Password Protected PDFs

Password protect existing pdf online