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.

voceplatforms

Jeff Stieler

Kevin Langley Jr.

Adds meta boxes to all post types and allows you to convert the post type of the current post you are editing to a different post type. This very useful when doing an import from another site into one post type that then needs to be filtered into different post types or even to fill dummy posts throughout multiple post types.
Please refer to full documentation at https://github.com/voceconnect/post-type-converter/wiki.

Post Type Converter

Allows you to convert the post type of objects while in the edit screen.

Force WebP vs Post Type Converter