How to Make a PDF Black and White (Grayscale, Properly)
The short answer
Make a PDF black and white by converting it in a tool with a grayscale setting — online converters do it in a minute, and if the PDF came from a document app, the cleaner route is exporting grayscale from the source. Printing in grayscale is a different thing (that’s a printer setting); converting the file itself changes the actual colors.
Convert a PDF to black and white
- Open a PDF tool with a grayscale conversion (the PDF tools page covers the common jobs).
- Upload the PDF, choose the grayscale or black-and-white option.
- Download — every color is now a shade of gray.
This is for when the file itself must be monochrome: printing at a copy shop that charges per color page, archival requirements, or documents that look more professional in B&W.
The better route: grayscale at the source
If you still have the original document (Word, PowerPoint, whatever made the PDF), grayscale it there instead:
- Word — File → Options → Advanced, scroll to Print, check “Print in grayscale” won’t help the file. Instead: change the images and text colors to grayscale, or export via the print-to-PDF trick with grayscale printing enabled — the resulting PDF is monochrome.
- Google Docs — same approach: set colors to grayscale before exporting to PDF.
Converting at the source keeps your layout and avoids the re-encoding that converters introduce.
The honest part
Three things to know about grayscale conversion:
- It’s lossy in spirit. The original colors are gone — a PDF converted to grayscale can’t be restored to color. Keep the original if you might need it.
- Contrast is the risk. Red and green often turn into similar grays, making charts and diagrams unreadable. Check any colored graphics after conversion — if a chart becomes a gray soup, the conversion is not the fix; a redesigned chart is.
- Scanned PDFs convert fine (they’re already gray-ish photos), but converting them doesn’t make them smaller — see compression if size is the goal, not color.