About this conversion
WebP is a modern format that, unlike JPG, still supports full transparency -- and it typically compresses noticeably smaller than PNG for the same visual quality, whether or not the image has transparent areas. This tool uses a real WebAssembly build of libwebp so you get a genuine WebP even on browsers (like Safari) whose built-in encoder is unreliable.
Frequently asked questions
Does WebP support transparency like PNG?
Yes, WebP supports a full alpha channel, unlike JPG -- so PNGs with transparency convert cleanly.
Is WebP supported everywhere?
All modern browsers support WebP for viewing. A small number of older tools/apps may not, so keep a PNG copy if you need maximum compatibility.
Why does this need WebAssembly?
Some browsers accept a WebP request but silently hand back a PNG instead of actually encoding WebP. Running libwebp directly in WebAssembly guarantees a real WebP file regardless of that gap.