What I want to do is convert a pdf file that has colorful fonts to one that all it's fonts' colors are black.

This is not a duplicate of this question here. I don't want greyscale fonts I want them to be only black. gs with psmono device is not an option since it was removed in later ghostscript releases.

1 Answer 1


Option 1:

convert -monochrome in.pdf out.pdf

Option 2:

You can still download Ghostscript 9.07


Compile it from source and make install the result.

In v9.07 the psmono output device still works. If you want to use the new v9.2+ version also, do not install the compiled v9.07 version but use it directly.


./gs907 -sDEVICE=psmono -o out.ps -f in.pdf

Note: the PSMono device will flatten your file and make the content text not selectable.


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