STEP BY STEP
The workflow
1
Convert the PDF to grayscale
Open Grayscale and drop in the file. Every page is converted to shades of grey, so the printer pulls from the black cartridge rather than the colour ones.
2
Fit more per page to save paper (optional)
If it's a reference doc or slides, run N-up to place 2 or 4 pages per sheet — fewer sheets on top of cheaper ink.
3
Compress before sending to the printer
Grayscale plus Compress makes a light file that spools fast at a shared or shop printer and emails cleanly to whoever's doing the printing.
WHY IT MATTERS
The case for doing this
Colour pages cost several times more to print than black-and-white, and most documents — reports, drafts, reference material — don't need colour to be useful. Converting to grayscale up front guarantees the printer uses only black toner, instead of relying on a printer driver's "print in greyscale" checkbox that colleagues forget to tick. It also makes the file render predictably: a chart that used colour to distinguish series will now use shades of grey, so it's worth a glance to confirm it's still readable. Pair it with N-up to cut paper too, and Compress so the file moves fast to a shared printer. Everything runs in your browser, so the document stays on your device.
COMMON MISTAKES
What to avoid
Grayscale can flatten colour-coded charts
If a figure relies on colour alone to tell series apart, greys may look similar. Check colour-coded charts after converting, and prefer ones with labels or patterns.
Relying on the printer driver instead
The driver's "greyscale" toggle is per-print and easy to forget. Converting the file itself makes black-and-white the default for everyone who prints it.
TIPS FOR THE BEST RESULTS
What works
Grayscale, then N-up, then Compress
That order gives you the cheapest print: black toner, fewer sheets, and a small file that spools quickly.
Keep a colour master
Convert a copy for printing and keep the colour original for on-screen sharing, where colour still helps.
RELATED WORKFLOWS
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Get a 40 MB scan under Gmail's 25 MB or Outlook's ~20 MB cap — without it turning to mush.
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Strip author names, software tags, and edit history before a document goes public.
FAQ
Questions about this workflow
Often a little, since colour data is dropped — but run Compress as well if you need a meaningfully smaller file.
Try the workflow on a real PDF
Free tools run in your browser. No signup, no watermarks.
Start with step 1