Everything Converting Strokes When drawing on vector layers, you may want to change brush strokes to pencil lines to convert contour strokes into centre line pencil strokes. NOTE Any line thickness information is lost upon conversion from brush to pencil At times, you may want to change pencil lines to brush strokes. This converts a centre line stroke to a contour line stroke. Or you can convert strokes to pencil lines. How to convert pencil lines to brush Select the strokes you want to convert. Right-click and Convert > Pencil Lines to Brush Strokes. How to convert brush to pencil lines Select the strokes you want to convert. Right-click and select Convert > Brush Strokes to Pencil Lines.