Converting your JPG, PNG or GIF image to WebP or AVIF is a very simple task with our ShortPixel Image Optimizer plugin. However, you may find that not all of your images or thumbnails are converted to WebP or AVIF. For example, in the screenshot below you can see that only the 600×338 thumbnail has a WebP counterpart:
If our algorithms generate a WebP or AVIF file that is more than 5% larger than the original image, our plugin simply does not store it on your server to reduce credit consumption and therefore will not deliver it to your website visitors.
If you still want to use the next generation images, even if they are larger, you should use a filter.