The retailer's product mix is to be redirected towards more organic produce, with a target of increasing sales in that segment nearly four-fold by 2022, it said.
The job cuts will come from voluntary departures, Carrefour said.
The Boulogne corporate headquarters will be closed and the planned project to build a new 30,000-square-metre headquarters in the Essonne department will be abandoned.
Cost-savings will total €2bn by 2020 as 2,400 workers at its French head office look set to be offered voluntary redundancy.More news: After false missile alarm, Ige couldn't log on to Twitter
The company announced a cost reduction plan of EUR2 billion on a full-year basis by 2020. His new transformation plan, focused on e-commerce, is meant to turn Carrefour into the "global leader in food transition". It also intends to reduce the number of ex-DIA stores by 273.
Meanwhile, following on from their cooperation for Carrefour Livraison Express, Carrefour and La Poste have also made a decision to launch this year a new delivery service from Drive Carrefour (hypermarkets and supermarkets).
In Argentina, Carrefour announced it is investing in the Maxi banner, launching the conversion of 16 hypermarkets in 2018.
The French company has put its faith in online: over the next five years, its omnichannel investments will go up by a factor of six and its online food sales have to reach five billion euro.More news: Alibaba Group Holding Limited (BABA) has current market capitalization of $459.05 Billion
Carrefour said its ambition is to become a key player in food e-commerce, with EUR5 billion in sales for the group and market share of at least 20% in food e-commerce market in France by 2022.
The companies added: "After successful roll-out in Paris and its immediate surroundings, followed by Lyon, Bordeaux, Toulouse and Montpellier, the Carrefour and La Poste groups will deploy the Carrefour Livraison Express service in 10 new cities in 2018: Clermont-Ferrand, Dijon, Grenoble, Lille, Nancy, Nantes, Nice, Reims, Rennes and Strasbourg".
Carrefour noted that it will rely on its physical network to offer to its customers a reliable and extensive omnichannel service.
Through the Tencent partnership, Carrefour said it will be improve its online visibility, increase the traffic of its offline and online retail activities and benefit from Tencent's "advanced digital and technological expertise to develop new smart retail initiatives".More news: Alexis Sanchez joins Manchester United from Arsenal; Henrikh Mkhitaryan moves to Emirates
The companies said they want to combine Carrefour's global retail experience and the technology strengths of Tencent, which operates the popular WeChat social media platform and other services.