Convert JXL to PNG
Drop JPEG XL (.jxl) files and download lossless PNGs with transparency kept. JXL is efficient and modern, but most browsers and apps still won’t open it, so PNG is the dependable, editable target.
PNG is lossless, so the converted image carries no new artifacts, and any alpha channel in the JXL comes through. Expect larger files than the JXL, since PNG does not use lossy compression.
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.