This article shows 3 ways to convert a color InDesign document to grayscale (black & white) - Export PDF, Use color blend or Export image.

Like the GIF (that's Graphics Interchange Format), the PDF (Portable Document Format) has survived and flourished through the digital age. That's partly because of its versatility: It's the go-to ...

InDesign offers extensive support for PDF files, which can simplify the process of shared proofreading tasks -- but PDF offers marginal editability.