A prompt will appear asking you to add the owner password. You don't need to, and you can leave the password blank. Press Enter. If there is an option to remove the ownership, use the arrow keys to select it, then click Yes. 2) The contents of the locked PDF file will be saved into a new PDF file. 3) Open that new PDF file in Preview and a prompt will appear asking how you want to unlock the PDF: just force quit it, or force quit and then reopen. (Note: if you don't click force quit, and force quit opens the locked PDF anyway, nothing is changed.) How to remove password from a PDF file on Windows 10 Free & Premium — How-To Geek Note: If you don't know how to do these steps, see How to unlock PDF on a Mac in macOS Monterey — How-To Geek When you try to open a PDF in Preview, the owner password-protection will pop up. Click the 'Clear access' button and the owner password will be cleared from your password-protected PDF. It will continue to work even after a restarts your computer. In that PDF will be a new version that's password-free. The owner protected PDF file must contain a specific image name to unlock the PDF. How to unlock a PDF file by using Macros Free. 1. Open the PDF and click the 'Preview' button. 2. In the Preview window, right-click on the page with an image and select: 'Preview...' → 'Set options...' → 'Preview Locked Image'. 3. In the new dialog box that appears, choose: 'Inspect' (click on the button in the upper right corner of preview) → 'Set options...' (not in the dialog box) → 'Show in Preview' (click on the image name that's already present in the file) → Save. (Not in the dialog box) 4. On the Save dialog, enter password-free and a password. Save the PDF file as normal (or choose another name). How to use Preview on Mac to unlock PDF files — Mac world Note: It's important to note that not all features are available in the Preview toolbar.