# `GSFontMaster scaleBy:`

*Instance Method*

## Declaration

```swift
func scale(by scale: CGFloat)
```

```objc
- (void) scaleBy:(CGFloat) scale;
```

```python
scaleBy_(scale: float)
```

## Parameters

- `scale` — The scale factor (1 means no scaling.)

## Discussion

Scales the Font Master Scales the vertical metrics, alignment zones and guide lines