Uses Google's WebP `dwebp` to decompress `webp` images into `png` images.

decompress_webp_files.sh

#!/usr/bin/env zsh

# decompWebp.zsh - Decompresses WebP files into PNG files.

set basedir=$1

for file in ${basedir}/**/*.webp ; do

   # ext = PNG, PAM, PPM or PGM
   ext=".png"
   
   src=(${file:t})
   dest=(${file:t:r})
   pngfile=${dest}${ext}
   
   echo "Decompress ${src} into ${pngfile}"
   
   dwebp ${src} -o ${pngfile}
   
   # optional: keep images in separate folders
   mv ${pngfile} ${basedir}/pngs/
done

# optional: archieve webp images?
zip ${basedir}/webp-archieve.zip ${basedir}/*.webp

# optional: dont need these?
rm ${basedir}/*.webp