If it's a 3D barcode, you might want to make sure you have each of the barcodes properly printed, as they tend to not work when a part is cut off. However, if it's a regular barcode, such as the ones on your food or bottles, then as long as the number is displayed, you should be fine. Another option is to simply scale the picture a tiny bit. The barcodes resize fine, and just 2 or 5% reduction should allow the whole page to be printed just fine.