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PDF Prints Gray Instead of Black and White? Fix It
You set your printer to black-and-white or grayscale mode, but the printout still comes out looking washed-out, faint, or oddly gray instead of crisp black text. This is a common complaint on printer support forums, and it's often not actually a printer problem.
By GaryLast updated 4 min read
Why this happens
Many PDFs are built with color values under the hood even if they look black on screen — text set to a very dark gray or a color profile that doesn't map cleanly to your printer's black-and-white mode. Your printer driver then has to guess how to convert that color data, and the result can come out lighter or grayer than expected, especially on printers that handle grayscale conversion differently from each other.
The fix: convert the PDF to grayscale first
Instead of relying on your printer driver to do the conversion at print time, convert the PDF itself to true grayscale before you print it. This removes the guesswork — every pixel becomes an actual shade of gray in the file itself, so what you see on screen matches what comes out of the printer.
- Open the PDF in a grayscale converter
- Download the converted, true-grayscale version
- Print the new file instead of the original
- Compare the result — text and lines should print noticeably crisper
If it's still not right
If the printout is still too light after converting to grayscale, check your printer's own print quality or ink-saving settings — some printers default to a 'draft' or 'economy' mode that intentionally prints lighter to save ink, which is a separate setting from the color/grayscale mode.
Step by step: make a grayscale copy for printing
- Open Grayscale PDF and choose your file.
- Convert it. Every page is redrawn in shades of gray and rebuilt into a new PDF.
- Download the new file and open it. It should look like the original with the colour removed.
- Print that file with your printer set to black and white, at normal or best quality.
Keep the original for everything except printing
Converting redraws each page as an image. The printout looks right, but in the grayscale copy the text can no longer be selected, searched or copied, and links stop working. Think of it as a print-only copy. Keep the original file for emailing, uploading and editing, and delete the grayscale one after printing if you do not need it.
Check the printer's black settings too
Colour printers can make “black” in two ways: with the black cartridge alone, or by mixing colour inks into a composite black. Composite black often looks brownish or soft on plain paper. Printer drivers word the choice differently, for example “black ink only” against “high quality grayscale”, and it usually sits under the colour or advanced tab of the print dialog. For text, choose the black-only option.
Some PDF viewers also have their own grayscale tick box in the print window. Using it together with the driver's grayscale mode means the page is converted twice, which can lighten it. Pick one place to do the conversion.
When the file is not the cause
- Toner or ink is low. Print the printer's own test page: if that is faded too, the PDF is not at fault.
- Draft, economy or toner-save mode is on. It deliberately lays down less ink.
- The document is a scan of gray-looking paper. A photographed page has a gray background because that is how the camera saw it. Rescan in better light, or use a scanner app's black-and-white mode.
- The text really is gray. Designers often use dark gray instead of black, and it prints lighter. Only the source document can change that.
A quick test before a long print job
Print one page that has both small text and a filled area, such as a table header. Compare the original and the grayscale copy side by side on the same paper. If the grayscale copy is clearly darker and sharper, use it for the full job. If they look the same, the cause is in the printer settings, and converting the file gains you nothing.
Frequently asked questions
Why does my printer's black-and-white mode still print gray?
The PDF may contain color values that don't map cleanly to your printer's grayscale conversion. Converting the file itself to true grayscale beforehand avoids that guesswork.
Does this change how the PDF looks on screen?
Yes, converting to grayscale changes the file itself so every page displays in shades of gray, not just when printed.
Will this work for scanned documents too?
Yes, this is especially useful for scanned PDFs that were captured in color but only need to be black and white.
Is my file uploaded to a server?
No, conversion happens entirely in your browser. Nothing is uploaded or stored.
Will converting to grayscale make the file smaller?
Often, but not always. Gray images usually take less space than colour ones, but a text document that is redrawn as images can end up larger than the original.
Can I still select text in the grayscale copy?
No. Each page becomes an image, so text is no longer selectable or searchable. Keep the original for anything other than printing.