pxz to webp conversion is typically searched by users that got .pxz graphics file (perhaps sent by friend), but are unable to open it in standard graphics editor and want to save or export it to another format, in this case WEBP. The only tool that can work with .pxz files is the online tool Pixlr, as a free user you can save several files per day, you will have to make account for that though.
Updated: August 4, 2023