How do I keep my mcdonalds fries crispy?

Online Answer
Use Your Stove. Turns out the best way to reheat those fries so that they're not just edible but absolutely delicious is to reheat them on your stovetop, just as you would with your leftover pizza. Spread them out in your best heavy skillet to ensure maximum crispiness (cast iron being the sine qua non, of course).
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Unless a battered fry, they are not adding in salt during the process. I recommend not salting the fries till they come out of the fryer and even then, waiting for an order before salting as the fries can turn limp prematurely if salted too soon..
Ingredients: Potatoes, Vegetable Oil (canola Oil, Corn Oil, Soybean Oil, Hydrogenated Soybean Oil, Natural Beef Flavor [wheat And Milk Derivatives]*), Dextrose, Sodium Acid Pyrophosphate (maintain Color), Salt. *natural Beef Flavor Contains Hydrolyzed Wheat And Hydrolyzed Milk As Starting Ingredients..
Chemicals on the list include dimethylpolysiloxane, sodium acid pyrophosphate, and tertiary butylhydroquinone (TBHQ) — which are all FDA-approved. So to end the clip, Imahara says, "At the end of the day it's not a 'Franken-fry' composed of chemicalsMcDonald's french fries are made from potatoes.
2. Frying fresh-cut potatoes. Soaking peeled, washed and cut fries in cold water overnight removes excess potato starch, which prevents fries from sticking together and helps achieve maximum crispness.