Howdy,
your project Transform colored PDF files to Black and White PDF files will be done professionally with the exact requirements mentioned in your description that "I need to convert about 100 different files that are very colorful into black and white......" so on
I am an expert Swift illustrator with skills including Photoshop Design, Adobe Illustrator, Graphic Design, Adobe InDesign and Photoshop.
I have a great reputation here on Freelancer in terms of my previous work and profile ratings.
For the quality of my services, my profile speaks for itself :
https://www.freelancer.com/u/ArtisticQueens
any specification regarding the coloring ?
I am available for further conversation and let me know if you have any further queries.