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Add effects to a PDF in Preview on Mac
You can modify a PDF opened in Preview using Quartz filters that add effects or change colours. For example, you can convert a colour document to black and white, or apply a sepia tone.
Go to the Preview app
on your Mac.Open the PDF you want to change.
Choose File > Export, click the Quartz Filter pop-up menu, then choose a filter.
See alsoAssign keywords to a PDF or image in Preview on MacReduce the size of a PDF in Preview on Mac