Convert JXL to WebP
Drop JPEG XL (.jxl) files and download web-ready WebP with transparency kept. JXL and WebP are both efficient, but WebP is the one current browsers actually render, so it’s the practical choice for putting a JXL image on a page.
The encode is lossy, so converting an already-compressed JXL is a second lossy pass. For a lossless target, convert to PNG instead.
Decoding note
JXL is not a native browser format, so it is decoded by a built-in engine that loads once per tab the first time you convert one.
Batch and privacy
Add multiple files, convert, and use Download all as ZIP for the whole set. Conversion runs in your browser; nothing is uploaded, and metadata is dropped when the image is re-encoded.