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Lock PDFs and images in Preview on Mac
You can lock a PDF or image so that it can’t be edited or deleted. If you own a locked document, you can edit the document after unlocking it. Others can change the document’s contents only by creating a duplicate of the document and editing the duplicate.
Go to the Preview app
on your Mac.Move the pointer next to the document’s name in the title bar, click
, then select or deselect the Locked checkbox.Tip: To lock or unlock a file in the Finder, select the file, choose File > Get Info, then select or deselect the Locked checkbox.