WebP

File Format
Name	WebP
Ontology	Electronic File Formats Graphics WebP ; ; ;
Extension(s)	.webp
MIME Type(s)	image/webp (unregistered)
PRONOM	fmt/566, fmt/567, fmt/568
Released	2010

WebP is an image file format developed by Google, primarily intended for use on web pages.

It can use either lossy or lossless compression. Its lossy compression is based on portions of the VP8 video compression format.

It uses the RIFF container format.

Identification

Files begin with bytes 'R' 'I' 'F' 'F' ?? ?? ?? ?? 'W' 'E' 'B' 'P'.

Google's WebP page
Wikipedia article
Online demonstrator - shows quality differences between similarly-sized images in JPEG, JP2, WebP and BPG formats