Los Angeles | Design software company Canva is forecasting more than 40 per cent growth this year as annualised revenue reaches $US2.3 billion ($3.5 billion) on the eve of its first major event targeting big US customers.

Having initially thrived on simple design products targeting individual users, the $US25.6 billion Sydney-based company is now trying to turn its slowing growth around, ahead of an expected US initial public offering, by tapping the large enterprise market.