Apple - How to increase font size of Eclipse globally?
Go to Preferences > General > Appearance > Colors and Fonts, expand the "Basic" folder and select "Text Font" and change that to whatever size you like.
For Eclipse Neon: To Increase Ctrl + To reduce Ctrl - for Macs, use the command key, not the control key
Inside the Eclipse.app is a setting for the font size. To make the fonts globally larger edit Eclipse.app » Contents » Eclipse » eclipse.ini and remove the line
-Dorg.eclipse.swt.internal.carbon.smallFonts
from the file. Save the file and restart Eclipse.
Solution for Eclipse Oxygen at MacOS High Sierra (Dec 2017)
Open terminal and run commands:
cd /Applications/Eclipse.app/Contents/Eclipse/plugins/org.eclipse.ui.themes_1.2.1.v20170809-1435/css vim e4_basestyle.css
Add a style:
* { font-size: 14; }
Restart Eclipse to apply changes.