Is it okay to resize my coupons to save paper&ink? will walmart still accept them?

I recently moved into my own place and the budgets tight. Usually when I get coupons from websites I just grab them and cut them out and use them as they are but I've ran into a few that take up half a page or sometimes an entire 8X11 inch sheet. Is it okay to resize coupons? Will the bar code still scan at walmart? If I shrink them, it saves paper, and ink for me. Just wondering if it's okay to print them smaller because an entire sheet of paper on one coupon stinks. Thanks! Also, I do most, if not all of my grocery shopping at walmart for convenience, so walmart coupon stories appreciated!