Q:

How to reset zoom in Eclipse?

In Eclipse one can use CTRL+ and CTRL- to zoom a text editor.
How can I reset the zoom level back to default(100%) ?

A:

Text zooming is implemented in Eclipse, by changing the preference of the editor text size. There is no Zoom 100% command, but you can reset the text editor font (assuming you are using the default text editor font):
In Window > Preferences: General > Appearance > Colors and Fonts select Basic > Text Font and click Reset and Apply and Close.

