Just tested on my self-hosted WordPress blog and it works without any plugins. WebP support was added to WordPress in 2021 with version 5.8: https://wordpress.

Just tested on my self-hosted WordPress blog and it works without any plugins. WebP support was added to WordPress in 2021 with version 5.8: https://wordpress.org/documentation/wordpress-version/version-5-8/#adding-support-for-webp https://wordpress.org/documentation/wordpress-version/versio... AVIF support in 2024, with v6.5: https://make.wordpress.org/core/2024/02/23/wordpress-6-5-adds-avif-support/ https://make.wordpress.org/core/2024/02/23/wordpress-6-5-add...