Make a PDF grayscale before printing

Colour pages on a mono printer can come out muddy or expensive. Convert to grey first — and know what you lose.

Tools used in this guide

The job

Mono printers print colour as grey anyway — but their own conversion can crush dark blues or make light yellows vanish. Converting the PDF yourself means you see the result before paper does. Each page is rendered at ~144 DPI, recoloured, and rebuilt as a new PDF.

Converting a document

Choose the PDF and convert. The output is a same-paged PDF in grey; download it and check a few pages before printing — especially anything where colour carried meaning (charts, highlighted text).

Encrypted, signed, and form PDFs aren't supported; up to 25 MiB and 60 pages.
Output pages are raster images — text is no longer selectable or searchable, and file size can grow.
For prepress-grade conversion (ICC profiles, rich blacks), a print shop does this properly.

Where it stops

This is a 'make it print cleanly' conversion, not a colour-managed one. If the document is a contract that must stay searchable, keep the original and send the grey copy for print only.