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Wal-Mart Announces Its Increasing Wages
Walmart employee Yurdin Velazquez pushes grocery carts at a Walmart store on February 19, 2015 in Miami, Florida.
Joe Raedle—Getty Images

Wal-Mart is expanding free grocery pickup service to several markets in the U.S. as it seeks to capitalize on its network of physical stores amid growing competition with and others investing in home delivery.

The world's largest retailer said on Tuesday that it would start offering curbside pickup for groceries ordered online in eight new markets this month - including Atlanta and Salt Lake City - with more to be added in the coming weeks.

Wal-Mart has been testing online grocery delivery services in two markets and pickup in the five markets of Denver, Phoenix, San Jose, California, Bentonville, Arkansas, and Huntsville, Alabama.

Read more: Why Amazon Wants to Deliver Your Groceries

Tuesday's announcement solidifies a strategy of playing to its bricks-and-mortar footprint, with an estimated 70% of the U.S. population living within five miles of one of its 4,600 stores.

"We are not walking away from delivery," said Michael Bender, Chief Operating Officer of global e-commerce at Wal-Mart. "But right now the focus for us is pickup, driven largely by what our customers are telling us."

The move comes as rivals attempt to find the right business model for tapping demand for pickup and delivery services.

Read More: This Grocery Store Will Give You a Free Uber Ride Home If You Buy $50 of Groceries

Target this month partnered with Instacart to deliver groceries for $3.99 per order in a pilot offering in Minneapolis. Amazon is testing delivery in Seattle, New York, Philadelphia and California, for a $299 annual fee.

Bender said Wal-Mart is targeting pickup in part because it allows customers to pinpoint a pickup time, rather than having to be at home at a set delivery time of fresh items. He cited a busy mother with children as an example of the type of customer that would benefit from the service.

Shoppers can choose from about 30,000 items, roughly the same assortment as in stores. After ordering and paying online, customers drive to the outlet at a designated time and workers load items into their cars. Fayetteville and Charlotte, North Carolina; Ogden, Utah; Nashville, Tennessee; Tucson, Arizona; and Colorado Springs, Colorado are the other new markets for the service.

Wal-Mart will add a new role of "personal shopper" to retrieve and store the items. In some cases, that will entail promoting workers within a store, but overall it expected to add some headcount related to the service, Bender said.

Neil Stern, senior partner at retail consultancy McMillan-Doolittle, said investing in pick-up makes sense from a cost perspective.

"The economics of pick-up are much better for a retailer. Delivering to the home remains costly, even as services like Instacart and Shipt attempt to reinvent the model," Stern said.

Read Next: Target Is Testing Grocery Delivery in This City