Vector Graphics Editor
Create and Edit SVG online - Scalable Vector Graphics
open janvas...
Transform Panel
The "Transform" panel shows the geometric properties: position, rotation, size.

Each transformation applied, by changing the values of the properties, starts from  the handle selected in the box, which represents a fixed point of the selected element in the page.

The button with the "chain" icon allows you to constrain the height and width ratio.
If you activate the chain button, changing the height value will also change the width proportionally; conversely, by changing the width you will set the height in proportion to the width.