If you're craving free McDonald's fries, today is the day. McDonald's is offering free fries for customers today and next Friday, WGN reported.

If customers use the Mobile Order & Pay app, they can choose to participate in Free Fries Friday, according to the company website.

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There's a catch, of course. Customers have to buy at least $1 worth of food, for the free medium fry. They can also only use the free fry deal once each week at a participating McDonald's, the website's fine print states.

Free fries aren't the only deal being offered. The site also says customers can get a free medium McCafé with a $1 purchase and $2 off a signature crafted sandwich once a week for most of April.

For more on the deals, click here.