Images to WebP

Table of Contents

Description

Statistics say that WebP format can save over a half of the page weight without losing images quality.
Convert PNG, JPG and GIF images to WebP and speed up your web, save visitors download data, make your Google ranking better.

automated test after plugin activation to make sure it will work on your server
works with all types of WordPress installations: domain, subdomain, subdirectory, multisite/network
works on Apache and NGiNX
image URL will be not changed so it works everywhere, in <img> src, srcset, <picture>, even in CSS backgrounds and there is no problem with cache
original files will be not touched
set quality of converted images
auto convert on upload
only convert image if WebP filesize is lower than original image filesize
bulk convert existing images inside /wp-content/ folders to WebP ( you can choose folders )
bulk convert only missing images
works with `Fly Dynamic Image Resizer` plugin

Hooks for developers

itw_extensions

Maybe you want to support also less famous JPEG extension like jpe, jfif or jif

add_filter( 'itw_extensions', 'extra_itw_extensions', 10, 1 );
function extra_itw_extensions( $extensions ){
    $extensions[] = 'jpe';
    $extensions[] = 'jfif';
    $extensions[] = 'jif';
    return $extensions;
}

itw_sizes

Maybe you want to disable WebP for thumbnails

add_filter( 'itw_sizes', 'disable_itw_sizes', 10, 2 );
function disable_itw_sizes( $sizes, $attachmentId ){
    unset( $sizes['thumbnail'] );
    return $sizes;
}

itw_htaccess

Maybe you want to modify htaccess rules somehow

add_filter( 'itw_htaccess', 'modify_itw_htaccess', 10, 2 );
function modify_itw_htaccess( $rewrite_rules ){
    // do some magic here
    return $rewrite_rules;
}

iwt_disabled_folders

Maybe you want to disable/enable some other folders for bulk convert

add_filter( 'iwt_disabled_folders', 'modify_iwt_disabled_folders', 10, 1 );
function modify_iwt_disabled_folders( $disabled ){
    // do some magic here
    return $disabled;
}

$images_to_webp->convert_image()

Maybe you want to automatically generate WebP for other plugins

add_action( 'XXPLUGIN_image_created', 'XX_images_to_webp', 10, 2 );
function XX_images_to_webp( $image_path ){
    global $images_to_webp;
    $images_to_webp->convert_image( $image_path );
}