By default, any text entered into the text widget goes through WordPress filters which doesn’t allow shortcodes to be executed.
Instead of seeing the final result, you will see the shortcode itself as plain text.
Shortcode Widget WUD activates easily shortcodes in your WordPress sidebar widgets.
Upon activation, you need to visit Appearance » Widgets page.
There you will find a text widget in the list of available widgets.
Simply add a text widget to a sidebar and then add your shortcode in the content box.
You can test it with the built in shortcode: [[sww-test]]
Don’t forget to click on the save button to store your widget settings.
Sample The result will be (like here in the sidebar):
Sample Without Shortcode WUD activated:
After installing Shortcode Widget WUD you will see in the menu SC Widget WUD (1).
In the settings page you can translate the sample shortcode strings (2) and find some info about the plugin (3).