How to convert the color format in pdf to black and white?

1. Download Adobe Acrobat X Pro10.1.2 or other versions. After selecting Finish Installation, a PDF virtual printer will appear.

2. Select the PDF printer, and then click Properties. In the Paper/Quality menu, two options will appear: black and white and color. Select the black and white option.

3. The "Save pdf file as" dialog box pops up, select the saving location and enter the file name.

4. Finally, click the Save button to convert the color document into a black-and-white document.