WebPconv

WebPconv is an application that can do batch conversions of JPEG/PNG files to WebP. It can also convert WebP files into a variety of other file formats. WebPconv can convert multiple JPEG or PNG files into WebP files at once. The conversion processes run parallel to each other, so they can be completed in a shorter time. You can also visually confirm the change in file size from before and after the conversion.

Supports libwebp 0.4.3; Adds File Open Button; Shows progress status on the Windows task-bar; Adds Resize option; Converts to animated webp from animated gif.