Zip all (original) images from media gallery

Best way to do it manually. By FTP just download the wp-content/uploads directory. If you want to automate this and the media files zip here is a plugin-

downML – Download Media Library

But it’s not updated for more than 2 years. So you have to test it before use it on live site.

There is another solution in my mind. If you can find a PHP Script to zip images from URL you can use this below code to get all the images URLs and create a zip from them. But this script will not very memory friendly.

All images URL code-

$query_images_args = array(
    'post_type'      => 'attachment',
    'post_mime_type' => 'image',
    'post_status'    => 'inherit',
    'posts_per_page' => - 1,
);

$query_images = new WP_Query( $query_images_args );

$images = array();
foreach ( $query_images->posts as $image ) {
    $images[] = wp_get_attachment_url( $image->ID );
}

Now you’ll get all the images URLs in $images.