I've got Adobe Acrobat Pro and I have a colorful file, and now i want that file to be converted in black and white.
How can I do it with pro options?
For Windows with Adobe Reader
File -> Print
Change printer to Adobe PDF (I don't think this option is for Mac)
There should be a convert to B&W checkbox and click print. You will now be asked to save the PDF.
Adobe Acrobat Pro (Windows and Mac)
Tools -> Preflight
Under "PDF fixups" select "Convert to grayscale". Then click "Analyze and fix". Name the file and save