Qrzysio

This plugin converts every uploaded JPG or PNG into a WebP image to make your site faster and lighter. It also removes the original file to save space and avoid duplicates, and sets the image alt text automatically from the filename.
<h3>Configuration</h3>
You can set the image quality in Tools → Force WebP. 
Choose your preferred value and save the settings. The new quality will be used for all images uploaded after you change it.

Force WebP

Say goodbye to JPG and PNG – make your site run on fast, modern WebP images.

Dhanendran Rajagopal

Initial version of this plugin is a fork of https://wordpress.org/plugins/taxonomy-converter/.
Copy or convert terms between taxonomies.
Taxonomies include categories, tags and any other custom taxonomies that may be present with your active theme and plugins.
This plugin, allows you to copy (duplicate) or convert (move) terms from one taxonomy to another or to multiple taxonomies, while maintaining associated posts.

Term Taxonomy Converter

Copy or convert terms between taxonomies.

Force WebP vs Term Taxonomy Converter