WebP is a modern image format developed by Google. It compresses photos and graphics more efficiently than JPG and PNG, so pages load faster and files take up less space — at the same visible quality.
The downside: some older apps and workflows still don't recognise WebP, which is why people often convert it back to JPG or PNG.
Convert to or from WebP with WebP to JPG, WebP to PNG, JPG to WebP or PNG to WebP.