Does cpdf have the function to merge pages?

[yahuudang]

For example, can it merge every two pages into one page, with the option to specify horizontal or vertical merging?

[johnwhitington]

For example, cpdf -impose-xy "2 1" in.pdf -o out.pdf or cpdf -impose-xy "1 2" in.pdf -o out.pdf. See 9.3 in the manual...