This plugin adds a spacer button to the WYSIWYG visual editor which allows you to add precise custom spacing between lines in your posts and pages. Note that you can also enter negative spacing to shift the following content upwards.

Spacer-1

Spacer Button

Spacer-2

Setting the spacer height

Spacer-3

Spacer height: 35px

Spacer-4

Spacer height: -35px