Originally Posted by ectoplasm
This is actually pretty sweet for automatically cropping text based PDF page margins. This is the first tool I found that does this automatically. If there are others, please comment. I'm not interested in the programs where you have to select a region by hand.
There is VeryDOC PDF-Margin-Crop from a few years ago.
It is not freeware but we can have about 40 trial croppings.
Just enter some margin value like 5X5x5x5 points or 10x10x10x10 and it will crop text based pdf nicely.
For pdf scan (with or without ocr layer) it is again (as in the case of soPdf) advisable to crop pdf roughly beforehand by Pdf-Scissors or Briss and then apply PDF Margin Crop, results were always good for me that way.
I also used to crop margins of text based pdfs by printing them in virtual printer, in Adobe Reader, Acrobat etc.
We should first check exact dimensions of text (usually under comments/measure/distance) and then print with auto-center box checked and corresponding Width x Hight.