Hello @danydandan
Thank you for reaching out and I am happy to assist you with this.
It would be awesome if you could share the website URL so I can check the website.
All images converted with the Image Service tool are sent to a third-party server maintained by the W3 Total Cache team which reduces resource consumption and allows for a large number of conversions in environments where resources can be limited such as shared hosting. Images sent to the W3TC server for conversion are only held temporarily and no permanent information is kept on the server regarding the images.
WebP optimizations with the Image Service tool do not replace the original image file and all conversions can be reverted without any loss of data.
Check if the image is converted by loading the image in the browser and replacing .jpg with .webp.
If you find that your original image has been converted to WebP, but other image sizes are missing WebP versions, you may need to double-check that your WordPress environment supports the WebP format.
While the original image is converted via our API service, the different sizes (e.g. Large, Medium, Thumbnail) are created by your own server. For this, you must have WordPress 5.8 and the appropriate libGD or ImageMagick package available on your server.
To check if your WordPress environment supports WebP, navigate to Site Health > Info > Media Handling and double-check that WebP is listed in the supported file formats for the library shown in the Active editor. If you find these are missing the WebP extension, consult your system administrator to set up the correct packages.

I hope this helps!
Thanks!
Hi @vmarko!
The site is under development, so I can’t share the URL with you (sorry!)
Yes, WordPress environment supports WebP. When I navigate to Network tab, the image is still image/jpeg not image/webp.
Any idea why? Thank you so much!!
Hello @danydandan
Without more details, I cannot determine what may be causing the problem.
As I’ve mentioned in the previous post, Check if the image is converted by loading the image in the browser and replacing .jpg with .webp for example:
https://yourwebsite.com/wp-contnet/uploads/some-image.jpeg
https://yourwebsite.com/wp-contnet/uploads/some-image.webp
If the image loads as webp, the problem is with the Imagic webp support.
YOu should also check if you are using an nginx proxy and if so, check if the nginx is handling the static files.
Also please share the Site Health > Info > Media Handling screenshot.
Thanks!
Hi @vmarko
The image loads when I replace .jpg to .webp but when I check the performance on Lighthouse it says it is still .jpg.
How can I attach screenshots here? I can’t find any option 🙁
I’ll share the screenshot online,
https://snipboard.io/Y4m9X1.jpg
Thank you!
Hello @danydandan
Thank you for the information and for sharing the Screenshot.
As I can see you are using GD instead of Imagic. Can you please try to update the GD to the latest 2.3.3 release
Thanks!