Freixas learned to draw from his cartoonist father Emilio Freixas, before studying at the School of Art of San Jorge and working to create stage sets. With his father, he worked for the magazine Lecturas and created the comic strip publication, Colección Mosquito, that first featured his most popular character, 'Pistol Jim' (later published in Chicos). By the late 1940, Freixas was developing his own style, distinct from his father's decorative line work.

In 1947, Freixas accepted work from Editorial Molino in Argentina and worked for nearly a decade in Buenos Aires, where he developed a looser and darker style. He worked with the great Argentinian comic author Héctor G. Oesterheld. He was a frequent visitor to the Pan-American School of Art and gave some classes.

Homesick, Freixas returned to Spain in November 1955. He joined Selecciones Ilustradas and from about 1956 provided work for Fleetway in England, including The Sun, Valentine, Marilyn, Bounty and others. He also continued to collaborate with his father.

In his later years, he provided work to the United States, Netherlands and Sweden. His final work was for the magazine Bathtub (Bardon Comics).