Note: this DOES NOT convert the file (obviously) although it will force it to be 'usable' in certain cases. If you bring the same file to a program that cannot work with webp format (ex. Da Vinci Resolve), it will crash or not show. To non-creators this is not an issue, but for creators: have fun figuring out which images you've saved are actually webp and won't work later on.

I know webp has become much less annoying after windows finally added webp support to photos after w11, so 'advice' like this tends to work more often than not. Just use a browser extension and convert it properly if you intend to spread an image...