Extensions
System - Image Optimizer converts Joomla images to WebP and AVIF
System - Image Optimizer is a paid Joomla plugin that converts images in the media library into WebP and AVIF formats.
Image conversion comes up because large, widely supported formats such as JPEG and PNG can make pages heavier than necessary. WebP and AVIF can reduce the bytes sent to visitors, but a site still needs suitable fallback handling and a workflow for processing existing files.
Joomla core provides the Media Manager for uploading and organising images, and template code can be overridden when a site needs different image markup or responsive-image behaviour. Those tools do not, by themselves, provide the workflow described here: according to the listing, this plugin can convert existing media-library images with one click and lets administrators adjust quality and compression. That is the gap it is intended to fill, rather than a replacement for Joomla's media management or a template override.
It is aimed at site owners, agencies and editorial teams with an established image library and a deliberate performance budget, especially where manually converting files would be tedious. A small site with few images, a team already handling conversion in its build or image pipeline, or a site that must retain only original formats has little reason to install it.
Before installing, note that the listing marks it as a paid download and states compatibility with Joomla 5 and 6. It identifies mixwebtemplates as the developer; the directory lists 56 other extensions from that developer, while this listing has no reviews. The page provides no support documentation, and leaves unanswered how conversion handles originals, filenames, references, fallbacks, storage, server requirements and rollback. Those details matter before processing a live media library.
Listed on the Joomla Extensions Directory.