Convert a PDF to grayscale
Make a colour PDF grey without turning the pages into pictures.
Text stays text: the colours are rewritten inside the PDF instead of turning the pages into pictures.
Printing in black and white on a colour printer still drains the colour cartridges, and some print shops charge colour rates for any page containing colour. A genuinely grey PDF avoids both.
Most converters rasterise every page, which works but destroys the document: no more selecting, searching or copying, and usually a much bigger file. This one rewrites the colour instructions inside the PDF instead, so text stays text and vectors stay sharp.
A few things can hide colour where no rewrite reaches — gradients, patterns, unusual colour spaces. So every page is rendered and checked afterwards, and the rare page that still shows colour is flattened to a grey image. You’re told exactly how many pages that affected.
How to use it
- Drop in the colour PDF.
- Wait while it converts and every page is checked.
- Download the grey version.
Frequently asked questions
Does the text stay selectable?
Yes, that’s the point of doing it this way. Only a page whose colour couldn’t be converted gets flattened into an image, and the result tells you when that happened.
Will the file get bigger?
Usually it gets slightly smaller, because colour images are converted to grey. Pages that had to be flattened can grow.
Can I just print in black and white instead?
You can, and for a one-off that’s simpler. Converting is for when the file itself must be grey: sending to a print shop, archiving, or a printer that insists on using colour ink.
Is this reversible?
No. Keep your original: the colour information is discarded in the converted copy.
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