Philip Newcomer

Sometimes developers need to filter the output of a widget that does not have its own output filter built-in. This plugin provides a filter which will allow developers to filter any widget’s output, regardless of whether it has that capability natively or not.
This plugin was inspired by a similar filter in the <a href="https://wordpress.org/plugins/widget-logic/" rel="ugc">Widget Logic</a> plugin, and essentially duplicates that functionality, but with more flexibility.
Usage instructions are <a href="https://github.com/philipnewcomer/widget-output-filters" rel="nofollow ugc">on GitHub</a>.
This plugin is developed <a href="https://github.com/philipnewcomer/widget-output-filters" rel="nofollow ugc">on GitHub</a>, and is available as a <a href="https://packagist.org/packages/philipnewcomer/wp-widget-output-filters" rel="nofollow ugc">Composer package</a>.

Widget Output Filters

A library which enables developers to filter the output of any WordPress widget.

Menkii

Removes line-breaks, tabs, double space, html comments and wordpress head-data from html output.

Output Optimizer

Removes line-breaks, tabs, double space, html comments and wordpress head-data from html output.

Widget Output Filters vs Output Optimizer