Fujitsu ScanSnap Advanced Operation Manual page 106

Example: When characters and illustrations are printed to fit in A4 size in the center of an A3 size
document
a The scanned image is output in B4 size.
To output the scanned image in its original size, specify the document size in the [Paper size] popu-up
menu.
HINT
For details about how to place documents into the Carrier Sheet and on the ScanSnap, refer to the
ScanSnap Manager Help.
Scanning Documents Larger Than A4 or Letter Size (For iX500, S1500, S1500M, S1100, or S510)
106