McDonald's launched the “I'm lovin' it” tagline in 2003.
The campaign began internationally in September 2003 and became one of the company's longest-running global branding platforms. Its lowercase styling and distinctive five-note musical motif helped create a consistent identity across television, radio, packaging, and digital advertising.
The campaign was developed with the German advertising agency Heye & Partner. The phrase was associated with the German expression “Ich liebe es,” and the English wording became the form used in many markets. Justin Timberlake appeared in an early advertising version, while the music was linked to the production team behind the campaign.
The tagline is sometimes confused with older McDonald's slogans such as “You Deserve a Break Today,” which belongs to the early 1970s. The two phrases represent different advertising eras.