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.

Sadat Himel

ThemeDot

Image Format Converter allows administrators to convert images in the WordPress Media Library between JPG/JPEG, PNG, WebP, and AVIF formats. Using server-side PHP libraries (GD or Imagick), it ensures high-quality conversions with minimal file size. Converted images are saved to the uploads folder and optionally added to the Media Library.
Features: 
– Select images via the WordPress media uploader. 
– Choose target format (JPG, PNG, WebP, AVIF). 
– Configure quality/compression and Media Library integration via a “Conversion Settings” button (admin-only). 
– View server library status (GD/Imagick/WebP/AVIF) with a “How to Enable GD and Imagick” button for setup instructions. 
– Modern, clean interface inspired by professional design standards (e.g., TinyJPG-like cards and buttons). 
– Secure, efficient, and admin-only (no frontend features).
Access all features on Media > Image Converter, with collapsible settings and instructions.

Image Format Converter

Convert images between JPG, PNG, WebP, and AVIF in WordPress admin with a modern UI. Requires GD or Imagick.

Force WebP vs Image Format Converter