Note: help and version output are generated by a naïve script which tries a few variants of
<command> --help, <command> -h etc. to find the command's help and version info.
Sometimes it gets lucky, sometimes it doesn't; if the output below looks wrong, it probably is.
cwebp -version (return code: 0)
cwebp -h (return code: 0)
cwebp [options] -q quality input.png -o output.webp
where quality is between 0 (poor) to 100 (very good).
Typical value is around 80.
Try -longhelp for an exhaustive list of advanced options.