How to Encrypt a PDF on Mac

Charlotte Daniels

Mac, Tutorials

Do you want to protect sensitive information in your PDF files? Encrypting a PDF on Mac is a simple and effective way to secure your documents.

In this tutorial, we will guide you through the steps of encrypting a PDF on your Mac using built-in tools. Let’s get started!

Step 1: Open the PDF File

To begin, open the PDF file that you want to encrypt by double-clicking on it or by right-clicking and selecting “Open With” followed by “Preview.”

Step 2: Access the Security Options

Once the PDF file is open in Preview, click on the “File” menu in the top menu bar and select “Export..” from the dropdown menu. This will open the Export window.

Note: If you want to encrypt a copy of the original file without modifying or overwriting it, make sure to select “Save As” instead of “Export.”

Step 3: Choose Encryption Options

In the Export window, navigate to the bottom section titled “Encrypt.” Here, you can choose different encryption options for your PDF file.

  • Password: Select this option if you want to add a password for opening the PDF file. Enter a strong password that combines letters, numbers, and special characters.
  • Show Password Hint: You can optionally provide a hint that will help you remember your password if you forget it.

    This hint should not directly reveal your password but give you a clue.

  • AES-256: Enable this option if you want to use advanced encryption standard with a key length of 256 bits. This provides stronger security for your PDF files.

Note: Enabling both password protection and AES-256 encryption will provide the highest level of security for your PDF files.

Step 4: Save the Encrypted PDF

After setting up the desired encryption options, click on the “Save” button in the Export window. Choose a location on your Mac to save the encrypted PDF file and click “Save.”

Step 5: Verify Encryption

To ensure that your PDF file is encrypted successfully, locate the saved file on your Mac and double-click to open it. You should be prompted to enter the password you set during encryption. Once entered correctly, you can access the contents of the PDF file.


Congratulations! You have successfully encrypted a PDF file on your Mac using built-in tools. By following these steps, you can protect sensitive information and ensure that only authorized individuals have access to your documents.

In this tutorial, we covered how to open a PDF file in Preview, access the security options, choose encryption options such as password protection and AES-256 encryption, save the encrypted PDF, and verify its encryption. Now you can confidently secure your important PDF files on your Mac!

Android - iPhone - Mac

 © 2023 UI-Transitions

Privacy Policy