To make PDF editable for redaction on mac, Cisdem PDF OCR Converter would be a great assistant to instantly export PDF and images into various editable formats with original file quality retained.
The easiest way goes to making PDF in editable formats on mac, then editing in Microsoft Word or other file editors, which are more open to unlimited editing. PDF is a perfect way to store and present information as closely as we expect, but editing a PDF is not that easy as editing other documents. Don’t just “Save” after adding these redaction actions, otherwise, these redaction actions will be withdrew by others with Preview and no information will be hidden or removed.
You can use preview, a handy free mac tool to redact PDF on mac.