The present invention provides a computer-implemented method and system for modifying given layout data on the basis of predetermined parameters for reducing unused white areas in accordance with a given printing layout. The invention is particularly applicable in the framework of label and tag printers employing continuous media. On the one hand, the reduction of unused white areas can lead to an overall reduction in the paper size, thus rendering the labels more environmentally friendly. On the other hand, the layout can also be improved, leading to a better usage of the available space for printing data thereon.