He was born in Vienna into a family of nobility from Trentino. His father Domenico (born in 1678) was a Baroque painter. Gianantonio and his brothers Niccolò and Francesco (also painters), later inherited the family workshop after their father's death in 1716. They probably all contributed as a team to some of the larger commissions later attributed to his brother Francesco Guardi. His sister Maria Cecilia married the pre-eminent Veneto-European painter of his epoch, Giovanni Battista Tiepolo.
He may have received his artistic training in Vienna, where he is first recorded in 1719, but had established a workshop in Venice by 1730. Among his first important clients was the connoisseur and collector Johann Matthias von der Schulenburg, for whom Guardi created numerous paintings with an Orientalist theme.
He produced copies after the work of other artists, as well as a series of originals with Turkish-inspired interiors as easel pictures for private decorations. Antonio Guardi trained his younger brothers Nicolò and Francesco in his workshop, the latter working closely with him as a figure painter before establishing himself as a vedutista in the late 1750s.
A founder member of the Accademia Veneziana in 1756, the elder Guardi produced several works for churches in Venice, notably in the Church of the Angelo San Raffaele, as well as decorative cycles for palaces and villas in the city and the surrounding countryside. Francesco Casanova was among his pupils.
He died in Venice in 1760.
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