Qrzysio

This plugin converts every uploaded JPG or PNG image into modern WebP format to improve performance and reduce file size.
Key features: 
– automatic conversion of JPG and PNG images to WebP on upload 
– correct generation of all WordPress image thumbnails 
– configurable WebP quality level 
– optional maximum image width (original images are resized before thumbnails are generated) 
– automatic removal of original JPG/PNG files to save disk space 
– full compatibility with WordPress “big image scaling” 
– automatic alt text generation based on the filename 
– filename sanitization and collision-safe renaming
All settings apply only to newly uploaded images. Existing media files are not modified.
<h3>Configuration</h3>
You can configure the plugin in Tools → Force WebP.
Available options: 
– WebP quality (0–100): controls compression quality for newly uploaded images 
– Max width (px, optional): limits the maximum width of original images before WordPress generates thumbnails (0 = disabled)
All settings affect only images uploaded after saving the configuration.

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