ShortPixel Adaptive Images doesn't serve WebP images, why is that?

First of all make sure you have this option active in Settings/ShortPixel AI

If you do have this setting active then WebP images should be served. Please note that the URLs of the images won't change so URL will still have the original (e.g. .jpg) extension but the actual image will be WebP. The reason for this is that changing the image extension in URL would have required an additional request and this is not optimal.

Take for example:

if you look at the image details you'll see that it is actually a WebP image as you can see below:

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