David Baumwald

*** 2022-09-12 UPDATE *** 
@matt published a post and codified a final decision that <a href="https://make.wordpress.org/core/2022/09/11/webp-in-core-for-6-1/" rel="nofollow ugc">WebP by default would not be coming to WordPress Core in version 6.1</a>. That being the case, this plugin will not be necessary for users to prevent WebP generation by default as part of the Core upload process.
Proposed to be included in WordPress 6.0 is a new feature to generate and use webp images by default. Specifically, when an image is uploaded, a WebP version of every image subsize is created. According to <a href="https://make.wordpress.org/core/2022/03/28/enabling-webp-by-default/" rel="nofollow ugc">the proposal</a>, one downside is that generating WebP versions along with the original JPEGs will “use an additional ~70% of the storage space to store both file types.” Although this is hugely beneficial to most websites and, more importantly, their visitors, some site owners may not be immediately able to increase the size of their storage to accommodate the additional files. For more information, see the proposal or <a href="https://core.trac.wordpress.org/ticket/55443" rel="nofollow ugc">the Trac ticket</a>.
To help site owners manage the transition, this plugin adds a setting under Settings -> Media to either enable or disable WebP creation on the initial upload of JPEGs. For Multisite installations, the plugin can be activated network-wide or on individual sites.
*** 2022-07-22 UPDATE *** 
Although the original implementation was not merged in 6.0 due to community feedback, changeset 53751(https://core.trac.wordpress.org/changeset/53751) merged an updated implementation that addresses some(but not all) concerns from the community. This merge will be part of the 6.1 release, unless further changes are needed. Some site owners may not be able to immediately cope with doubling their required storage allotment with their host, so the original goal of this plugin remains. The code has been updated to disable WebP creation on upload globally. There is a new ticket discussing the possibility of making this feature into a setting(see https://core.trac.wordpress.org/ticket/56263). However, given WordPress’s core philosphy of “Decisions, Not Options”, it’s unlikely to proceed.

Disable WebP By Default

Thank you for creating this plugin!  It's a shame it's necessary, but I appreciate that you created it to make it easier for site owners to be able to take back control over their sites without needing to know how to add a filter.

Thank you!

Thank you for your work with this plugin (and just keeping track and reporting all the latest WEBP changes, etc.). Great to find so much useful information in the plugin documentation. Very much appreciated!

Thank you

A small plugin to control WebP image creation when JPEG images are uploaded.

badasswp

As an internet user, you already know images can be the difference between a great website experience and a terrible one! Think about how often you’ve landed on a website and hit the back button because the home page was too busy or the banner image was taking so much time to load due to its size.
You may not realize it, but imagery is a large part of it. This plugin helps take care of all those concerns, by converting your WordPress images to WebP format during page load so that your site loads extremely fast, without any disruptions or downtime.
<h4>✔️ Features</h4>
Our plugin comes with everything you need to convert your WP website images to WebP.
✔️ Convert your WP images to WebP feature. 
✔️ Convert images on both upload and page load. 
✔️ Conversion Quality & WebP Engine options. 
✔️ Error Loggging Capabilities. 
✔️ Custom Hooks to help you customize plugin behaviour. 
✔️ Compatible with Divi & Elementor page builders. 
✔️ Available in mutiple langauges such as Arabic, Chinese, Hebrew, Hindi, Russian, German, Italian, Croatian, Spanish & French languages. 
✔️ Backward compatible, works with most WP versions.
<h4>✨ Getting Started</h4>
<ol>
<li>Locate the Media menu option on the left side of the WP admin dashboard.</li>
<li>You should see the Image Converter for WebP menu listed as one of the options, click on it.</li>
<li>You can now set your plugin options here. Ensure you enable the Convert Images on Upload option.</li>
<li>Now upload any image into your WP website, it would convert it to a WebP format that will be served on your pages when users visit your website.</li>
<li>You’re all set!</li>
</ol>
You can get a taste of how this works, by using the <a href="https://tastewp.com/create/NMS/8.0/6.7.0/image-converter-webp/twentytwentythree?ni=true&origin=wp" rel="nofollow ugc">demo</a> link.
<h4>⚡ WooCommerce, Posts, Pages & Images</h4>
By default, Image Converter for WebP, will serve WebP images for your posts, pages and woocommerce pages. For future releases, you should be able to toggle this feature ON/OFF based on your needs.
NB: The Convert Images on Page Load option helps you convert and serve WebP images for images that were already uploaded on your WP website before the plugin was installed. It does this when the page or post that contains that image is loaded.
<h4>🔌🎨 Plug and Play or Customize</h4>
The Image Converter for WebP plugin is built to work right out of the box. Simply install, activate, configure options and start using straight away.
Want to add your personal touch? All of our documentation can be found <a href="https://github.com/badasswp/image-converter-webp" rel="nofollow ugc">here</a>. You can override the plugin’s behaviour with custom logic of your own using <a href="https://github.com/badasswp/image-converter-webp?tab=readme-ov-file#hooks" rel="nofollow ugc">hooks</a>.
<h3>Contribute</h3>
If you’d like to contribute to the development of this plugin, you can find it on <a href="https://github.com/badasswp/image-converter-webp" rel="nofollow ugc">GitHub</a>.

Image Converter for WebP

Convert your WordPress JPG and PNG images to efficient WebP format, improving performance, reducing file size, and enhancing website speed.

Disable WebP By Default vs Image Converter for WebP