New York, New York - Fast food franchises and restaurants in the United States, including McDonald's and Wendy's, are getting ready to treat customers with free or discounted French fries to celebrate National French Fry Day on Wednesday, July 13.

French fries, whose origins can actually be traced to Belgium, are one of the most popular side dishes worldwide, so it's no wonder they have their own annual celebration.

On Wednesday, McDonald's will give away free orders of large fries to its loyalty program members with no purchase necessary – but it can be ordered through their app. McDonald's reportedly uses around 7% of all potatoes grown in the United States for its fries.

The burger giant also offers a free McFlurry of any size for any purchase of at least $1. McDonald's new Camp Promotion already offers month-long free and discounted food items throughout July.

Wendy's is also offering a free order of fries with any purchase through their mobile app, available to digital loyalty program members. The chain has initiated a Fry Week, offering free fries with specific purchases that will change each day this week.

Burger King's Royal Perks members can get a free order of Chicken Fries with any $3 purchase on July 13. The company already offers a free order of fries with any purchase once per week for the rest of the year.

For Fatburger customers, a free order of fat or skinny fries will be available from July 13 to 19 with any purchase made in-store or online.