# scaleUpem: Tools to change the units-per-Em value in a font

## Overview

The `fontTools.ttLib.scaleUpem` module is a helper for `fontTools.ttLib`.

Change the units-per-EM of a font.

AAT and Graphite tables are not supported. CFF/CFF2 fonts are de-subroutinized.

fontTools.ttLib.scaleUpem.scale_upem(font, new_upem)

  Change the units-per-EM of font to the new value.

class fontTools.ttLib.scaleUpem.ScalerVisitor(scaleFactor)

  Bases: `TTVisitor`

  scale(v)