Chaplin's childhood in London was one of poverty and hardship. His father was absent and his mother struggled financially – he was sent to a workhouse twice before the age of nine. When he was 14, his mother was committed to a mental asylum. Chaplin began performing at an early age, touring music halls and later working as a stage actor and comedian. At 19, he was signed to the Fred Karno company, which took him to the United States. He was scouted for the film industry and began appearing in 1914 for Keystone Studios. He soon introduced and adopted the Tramp as his screen persona. He directed his own films and continued to hone his craft as he moved to Essanay Studios, where the Tramp persona was developed emotionally in The Tramp (1915). He then attracted a large fanbase and demanded more money as he moved to Mutual and First National corporations. By 1918, he was one of the world's best-paid and best-known figures.

In 1919, Chaplin co-founded the distribution company United Artists, which gave him complete control over his films. His first feature-length film was The Kid (1921), followed by A Woman of Paris (1923), The Gold Rush (1925), and The Circus (1928). He initially refused to move to sound films in the 1930s, instead producing City Lights (1931) and Modern Times (1936) without dialogue. His first sound film was The Great Dictator (1940), which satirised Adolf Hitler. The 1940s were marked with controversy for Chaplin, and his popularity declined rapidly. He was accused of communist sympathies, and some members of the press and public were scandalised by his involvement in a paternity suit and marriages to much younger women. The Federal Bureau of Investigation (FBI) opened an investigation, and Chaplin was forced to leave the U.S. in 1952 and settle in Switzerland. He abandoned the Tramp in his later films, which include Monsieur Verdoux (1947), Limelight (1952), A King in New York (1957), and A Countess from Hong Kong (1967).