McDonald's introduced “I'm lovin' it” as a global marketing campaign in 2003.
The campaign began internationally in 2003 and became one of the most durable phrases in McDonald's modern branding. Its lower-case wording and informal tone were intended to present the brand as contemporary, upbeat, and connected to everyday enjoyment rather than only to a particular menu item.
The campaign was associated with music and short-form advertising, helping McDonald's create a consistent identity across multiple countries. The English phrase was retained in many markets, while local executions and translations varied.
A frequent confusion concerns the song and the slogan. The campaign's musical materials included the track “I'm Lovin' It,” while the phrase itself functioned as the advertising tagline. The global campaign launch date is 2003, even though individual advertisements and music releases appeared in different places at different times.