Software for post-processing of 2D - DXF graphics and drawings (DXF format 12 or lower) which are intended for CNC machining. For the use of CAD- and graphics data for CNC machining curve elements such as ellipses, bezier-curves and splines are often decomposed into polylines or into very small line segments. The software DXF R12 CNC Polyline Reducer allows the transformation of such small line segments into circular arcs and longer lines for an improved CNC machining. Also the program has a function for smoothing converted curves. In addition, the quality of scanned polyline graphics can be greatly improved. Functions: Reduction of the number of lines, convert small lines or polylines into arcs, smoothing of generated curve contours (Curves are converted in preferably tangential arcs and lines). Purpose: Improvement of workpiece quality, avoiding jerky movements during CNC machining, which can occur by too many small line segments, time-saving.