William P. Davis

<p>This plugin allows you to duplicate images you have in the media library and attach them to a new post, rather than having to create a new copy of the image and upload it to WordPress again.</p>
<p>It works by copying the post and its metadata. It does not actually copy the image. Any changes you make to the new copy of the attachment — updating the caption or cropping, for example, will only be applied to the new attachment, not to the original.</p>
<p>This is useful if you query posts for its attachments to display photos, or if you make use of galleries and have old images you might want to include, among other things.</p>
<p>To use, go to the Library tab in a post. You should see an ‘Attach’ link.</p>


BDN Duplicate Images

Allows you to duplicate images in the media library and attach them to the current post.

kubiq

<p>Statistics say that WebP format can save over a half of the page weight without losing images quality.<br />
Convert PNG, JPG and GIF images to WebP and speed up your web, save visitors download data, make your Google ranking better.</p>
<ul>
<li><strong>automated test after plugin activation to make sure it will work on your server</strong></li>
<li><strong>works with all types of WordPress installations: domain, subdomain, subdirectory, multisite/network</strong></li>
<li><strong>works on Apache and NGiNX</strong></li>
<li><strong>image URL will be not changed</strong> so it works everywhere, in <img> src, srcset, <picture>, even in CSS backgrounds and there is no problem with cache</li>
<li><strong>original files will be not touched</strong></li>
<li>set quality of converted images</li>
<li>auto convert on upload</li>
<li>only convert image if WebP filesize is lower than original image filesize</li>
<li>bulk convert existing images to WebP ( you can choose folders )</li>
<li>bulk convert only missing images</li>
<li>works with `Fly Dynamic Image Resizer` plugin</li>
</ul>
<h3>Hooks for developers</h3>
<h4>itw_sizes</h4>
<p>Maybe you want to disable WebP for thumbnails</p>
<pre><code>add_filter( 'itw_sizes', 'disable_itw_sizes', 10, 2 );
function disable_itw_sizes( $sizes, $attachmentId ){
    unset( $sizes['thumbnail'] );
    return $sizes;
}
</code></pre>
<h4>itw_htaccess</h4>
<p>Maybe you want to modify htaccess rules somehow</p>
<pre><code>add_filter( 'itw_htaccess', 'modify_itw_htaccess', 10, 2 );
function modify_itw_htaccess( $rewrite_rules ){
    // do some magic here
    return $rewrite_rules;
}
</code></pre>
<h4>itw_abspath</h4>
<p>Maybe you use roots.io/bedrock or other custom folder structure</p>
<pre><code>add_filter( 'itw_abspath', 'modify_itw_abspath', 10, 2 );
function modify_itw_abspath( $abspath ){
    return trailingslashit( WP_CONTENT_DIR );
}
</code></pre>
<h4>$images_to_webp->convert_image()</h4>
<p>Maybe you want to automatically generate WebP for other plugins</p>
<pre><code>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 );
}
</code></pre>


Images to WebP

Great

Convert PNG, JPG and GIF images to WebP and speed up your web

BDN Duplicate Images vs Images to WebP