He trained at La Llotja, the Barcelona School of Fine Arts, and in the workshop of his father, Dionís Renart i Bosch, alongside his brother, the sculptor Dionís Renart. He was a student of Ramon Martí i Alsina and F. Soler i Rovirosa.

He was extremely versatile: in addition to his artistic work, he held several posts in the cultural sphere. In 1903, together with P. Ricard, he founded Foment de les Arts Decoratives (Promotion of Decorative Arts - FAD) and was chairperson of the Cercle Artístic de Sant Lluc (Artistic Circel of Saint Luke) and the Orfeó Català choral society, among others. Parallel to this, he ran his father's workshop, which made reproductions of paintings, engravings, images, etc.

As well as painting, he also designed stained glass windows for Rigalt, Granell i Cia, a room at the International Exhibition of 1907 and one or two commercial establishments.

He excelled with his fully Modernista designs for bookplates, in which he gave greater prominence to the central figurative elements surrounded by ornamentations of wavy lines. In 1907 he published a book, Els ex-libris de Renart (Renart's Bookplates), with the studies for his designs, at the Oliva printshop. When the Noucentista ("1900-ist", a term coined in 1906 to refer to 20th century Catalan culture) aesthetic boom occurred, his production declined, as he did not feel identified with it.

He was a collector of popular engravings, toys and paintings by artists of the period.