Reduce too big scans to DIN A4

[ingredio]

Hello, unfortunately I keep getting documents scanned in too large that I have to combine with others in an A4 pdf file. To do this, I would need to know how to conveniently scale down the individual pages.

[JR Boulay · Accepted solution]

You must use the Preflight tool:

[ingredio]

Thanks so much for your great and helpful explanation.