WebP is a modern image format that provides superior lossless and lossy compression for images on the web. Using WebP, webmasters and web developers can create smaller, richer images that make the web faster.

It is good for rendering on the browsers but common image tools still don't support webp format.

Here is the simple way to convert webp image format to common format like png and jpeg.

WebP Converter Download

Convert your favorite collection from PNG and JPEG to WebP by downloading the precompiled cwebp conversion tool for Linux, Windows or Mac OS X.

Precompiled utilites download here

https://developers.google.com/speed/webp/docs/precompiled

It's easy to download the library via Homebrew or MacPorts

brew install webp

once installed successfully, you can use the decoder library dwebp

dwebp filename.webp -o filename.png

See below

webp format images ready for conversion to png, jpeg
convert the webp image using dwebp command
dwebp conversion successful
Moto G Power webp image converted to png