WebP

• Extension: webp
• Specification: https://developers.google.com/speed/webp/docs/riff_container
• Samples: http://samples.mplayerhq.hu/image-samples/webp/

WebP is an image format developed developed by Google. It uses a RIFF based container format and employs VP8 for lossy and VP8L for lossless image compression.

References

• Official website