How can I crop every page of a large PDF file?

Here are two products that do PDF crop:

PDF-XChange Viewer
Commercial with trial.

PDFill PDF Tools
Completely free.

I haven't used them, so do not know if they do crop all the pages at once.

PDF Scissors apparently is designed for the sole purpose of PDF cropping.

Key Features inc.

• No installation required. Just click the start button,
• Take those extra margins aways with easy cropping tool!
• Avoid accidentally cropping some texts
• Scanned book? Crop odd/even pages separately
• Complex pdf? Crop individual pages separately with full freedom.
• Create crop areas easily

The website includes a short introductory video as well.