How to Convert a PDF to Grayscale (Save Color Ink When Printing)
Color ink is expensive and most office printers default to color even when grayscale would suffice. Converting a PDF to grayscale up front saves ink, lets you print on B&W-only printers, and often shrinks file size by 30%.
The problem
You have a color report you need to print 50 copies of. Color printing at the office is metered, $0.30/page. Grayscale is $0.04/page. Convert once, save $13.
Step-by-step
- 1
Open the Convert to Grayscale tool
Drop your PDF in.
- 2
Pick conversion mode
"Standard grayscale" preserves visual contrast. "High contrast" maximizes black/white separation (useful for text-only docs). "Photo grayscale" preserves photographic gradient.
- 3
Preview a sample page
Make sure colored text and charts are still readable. Light yellows/pastels can look invisible after grayscale conversion.
- 4
Convert and download
New PDF is grayscale. Print from any PDF reader.
- 5
Compare file size
Grayscale PDFs are typically 20-40% smaller than color originals because the color channel is removed.
Pro tips
- •Most PDF readers offer print-time grayscale conversion (Print → Properties → Black and White). For one-off prints, that's simpler. For sharing a grayscale PDF, do the conversion once.
- •For charts and graphs that rely on color coding, grayscale conversion can make them illegible. Consider redoing the chart with patterns or labels first.
- •Photographic content loses dynamic range in grayscale. Use Photo grayscale mode for best results.
- •After converting, run [Compress PDF](/en/tools/compress-pdf) for additional size reduction.
Frequently asked questions
Will the original PDF be modified?
No — PDFShed creates a new grayscale PDF. Your original color PDF is untouched.
Can I convert just specific pages?
Use [Extract Pages](/en/tools/extract-pages) to pull pages first, convert those, then [merge](/en/tools/merge-pdf) back into the original if needed.
Does grayscale conversion work on scans?
Yes — color scans become true grayscale. Often improves OCR accuracy too.
What about black-and-white (1-bit) conversion?
PDFShed offers "High contrast" mode which approximates 1-bit B&W. True 1-bit is rare and only useful for fax or low-end laser printers.