Convert a Color PDF to Black and White for Printing

To print a color PDF in black and white, convert the file first: open Grayscale PDF in Docmint, choose Grayscale for pages with photos or charts or Black & White for plain text, set the resolution to 150 DPI and click Convert. If you only need a single print and don't need to keep a gray copy, the grayscale option in your printer dialog is often enough.

Grayscale or black and white: what is the difference?

Grayscale keeps every shade between white and black. A blue chart line becomes a mid gray, a red heading becomes a darker gray, and photos still look like photos. It is the right choice for reports, slide decks, brochures and anything with images or colored charts.

Black & White (sometimes called 1-bit or thresholded) turns every pixel into either pure black or pure white. Text comes out crisp and the files are the smallest you can get, but photos turn into blotchy shapes and light-colored elements such as pale table shading or yellow highlights can disappear completely. Use it for text documents, forms, contracts and receipts.

If you are unsure, convert one page both ways and compare. A page range lets you test on a single page before you convert the whole document.

Why convert the file instead of ticking grayscale when printing?

Printer dialogs usually offer a grayscale or black-and-white setting, and for a one-off print at your own desk that is perfectly fine. Converting the file is better when the setting is out of your hands: sending a document to a print shop, a shared office printer, a colleague, or a print-on-demand service. A grayscale PDF prints the same on a color printer and a mono printer, so there are no surprises.

It also helps with toner. Some color printers build dark grays and even black from a mix of colored toners, so a page that looks neutral on screen can still use colored toner. When the file itself contains only gray, there is no color information for the printer to act on.

Finally, a converted file shows you exactly how the print will look. Charts that relied on color to tell lines apart may become hard to read in gray, and it is better to find that out on screen than on paper.

How to convert a PDF to black and white with Docmint

The conversion runs entirely in your browser, so the document is never uploaded.

1. Open the Grayscale PDF tool and drop your color PDF into it.
2. Choose the mode: Grayscale keeps shades, Black & White thresholds everything to pure black or white for the smallest files.
3. Set the output resolution. 150 DPI is plenty for office printing; use 200 to 300 DPI if the document has small print.
4. Optionally enter a page range to convert only some pages. The other pages are copied unchanged.
5. Click Convert, check a page or two, and download the result.

Will the text still be selectable after converting?

No. The tool re-renders each page as an image, which is how it guarantees there is no color left anywhere on the page. That means you can no longer select, copy or search the text in the converted pages.

For printing this rarely matters. If you also need a searchable copy, run OCR PDF on the result to add an invisible text layer back, or simply keep your original color file for on-screen use and use the gray copy only for printing.

Does converting to grayscale make the PDF smaller?

Often, but not always. For scanned documents and image-heavy files, grayscale page images are typically around a third of the size of color ones, and Black & White goes smaller still. That makes a gray copy a good option when a color scan is too big to email.

For a text-only PDF exported from a word processor, the opposite can happen. Those files store text as compact vector instructions, and turning each page into an image can make the file larger than the original. If file size is your main goal for that kind of document, Compress PDF in Lossless mode is the better tool.

Resolution is the other lever. Every step up in DPI makes the page images larger, so pick the lowest setting that keeps your smallest text clear.

Common mistakes to avoid

1. Using Black & White on photos or shaded tables. Light tints vanish and photos lose their detail. Switch to Grayscale for those pages.
2. Choosing a very low resolution for fine print. Footnotes and small table text can blur; go up to 200 or 300 DPI.
3. Deleting the color original. The conversion cannot be reversed, so keep the source file.
4. Forgetting about charts that use color as the only way to tell series apart. Check them in the gray version before printing a large batch.

Other ways to print a PDF in black and white

Most print dialogs, including those in macOS, Windows and common PDF readers, have a grayscale or black-and-white option. Desktop PDF editors can also convert colors with print production or preflight features. These are good choices when you print from your own machine.

Docmint is useful when you need a gray file you can hand to someone else, when you want to reduce a color scan's size, or when you'd rather not install software. If you also want to fit more on each sheet, the N-up tool can follow the conversion, so you can save toner and paper in the same session.