Hi @jtohme, we’re happy to help!
WP Compress does support modern image formats, including WebP conversion for JPG images, so it sounds like something may not have been configured correctly or didn’t work as expected on your site.
We’d be happy to take a closer look and help get this sorted out. Please reach out to our support team via live chat at https://wpcompress.com/support
and we’ll assist you directly and make sure it’s running smooth on your website.
Please let us know if we can help with anything else at all! 