automation to shrink page margins in pdf

I happen to have dozens of pdfs with over 500 pages in each. They written content in all these pdf occupy a small portion in the center of the page leaving a lot of margin outside of the page. This shrinks the character size. I am trying to see if there is a way to stretch the written content to occupy more page (zoom in with constant page size). Is there any pdf tool that can help me trim the top/bottom/right/left margin in bulk? Something that takes pdf as input and page ranges to modify this way?

See the image to understand my scenario.

Thanks

a page from the pdf

The "typical" example you supply is not uncommon for this problem task. Often the cover is greater area than subsequent content pages. In addition books often have significantly variable amounts of void space around the body.

You could try to use a viewer in fit content mode but the experience would be highly variable leading to view-sickness (my term for nearest to see-sickness)

My suggestion is use the venerable "Briss" (v0.9) or 2.0 where you can quickly tune manually a good compromise across rafts of erratically variable pages. It took only seconds to download install and set the ideal manual tweaked output for the 580 pages using 0.9 to skip page 1. using an auto crop tool usually results in tweaking the outputs in many cases like this one.