\documentclass[10pt,a4paper]{article} \usepackage[utf8]{inputenc} \usepackage[T1]{fontenc} \begin{document} « guillemets » \end{document}
\documentclass[10pt,a4paper]{article} \usepackage[latin1]{inputenc} \usepackage[french]{babel} \usepackage[T1]{fontenc} \begin{document} \og guillemets \fg{} \end{document}