FXG supports this functionality using the maxFontSize and fontSize parameters. maxFontSize sets the maximum allowed size and fontSize sets the minimum size. The W2P server attempts to fit any text you create into the defined text box in the document. It doesn't shrink or grow the text beyond those sizes. However, if the text is sized over an image, any cropping or layering above that image makes it appear as if the text is overflowing the bounds of the image.