This book constitutes the proceedings of the 12th International Symposium on Smart Graphics, SG 2014, held in Taipei, Taiwan, in August 2014. The 14 full and 4 short papers presented in this volume were carefully reviewed and selected from 26 submissions. They are organized in topical sections named: data visualization; sketching and multi-touch interaction; aesthetics and smart tools for artists; smart tools for 3D contents; and posters.