Images

PHP library / CLI

PicoWebP

A WebP encoder written in PHP, for hosts without GD, Imagick or cwebp. Converts PNGs and baseline JPEGs, preserves transparency and embedded colour profiles, and supports resumable encoding for background jobs.

IndexLane Safe WebP Queue

A WordPress plugin that creates WebP copies of your images while keeping the originals. Convert on the server or use the optional browser mode when your host cannot write WebP, with progress reporting and checks before converted files are saved.