By PDFKits Team — Published July 2, 2026
Color PDFs look great on screen but cost more to print and produce larger files. Whether you want to save on ink, shrink a document, or meet a submission requirement, knowing how to convert pdf to black and white gives a clean, professional result in seconds. You can optimize and recolor a PDF online, and this guide explains grayscale vs true monochrome so you pick the right one.
| Type | Keeps gray shades? | Best for | File size |
|---|---|---|---|
| Grayscale | Yes | Photos, gradients | Smaller than color |
| True black & white | No (pure B/W) | Text, line art, faxes | Smallest |
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Open the PDF, press Ctrl+P (or Cmd+P), choose Microsoft Print to PDF or Save as PDF, and enable Grayscale in the print settings. Honest limitation: some print drivers keep hidden color data, so the file may not shrink much, use a dedicated tool if size matters.
If you need true monochrome rather than gray shades, use a tool that offers a black-and-white or bitonal mode. This is common for archived documents and faxes where pure black text keeps file sizes tiny and edges sharp.
Black and white PDFs print cheaper, scan faster, and produce smaller files. To shrink them even more for email, compress the PDF after converting.
How do I convert a pdf to black and white for free? The free PDFKits optimize tool converts color PDFs to grayscale or black and white at no cost.
What is the difference between grayscale and black and white? Grayscale keeps gray shades; true black and white uses only pure black and white pixels.
Will converting reduce my file size? Usually yes, especially with true monochrome, which removes color data.
Converting a PDF to black and white saves ink, shrinks files, and gives a clean, formal look. For a quick, private conversion with grayscale and true monochrome options, use the PDFKits optimize tool in your browser.