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WebP only works on ~73% of browsers (https://caniuse.com/#feat=webp, no Firefox/Safari/Edge support), so it's a little early to switch all your images to it. MozJPEG is a good JPEG compressor.

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You can use the HTML5 <picture> element to add a fallback jpeg for all browsers that don't currently support Webp

Even better: you can let your image server check the accepted formats in the request header and send webp content transparently instead of jpg. Then you don't have to change your markup at all.

Browser's don't really care about file extensions.

https://github.com/uhop/grunt-tight-sprite/wiki/Recipe:-serv...

Oh. Thanks! I didn't know that was possible

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