If you've ever downloaded a .jxl file and watched your browser shrug at it, you've met the JPEG XL problem: it's a genuinely great image format that almost nothing opens yet. So I built a small tool that converts images to and from JPEG XL entirely in the browser — no upload, no account, no server touching your files.
Live: https://jpegxlconvert.com · Source: https://github.com/robertcassch-dot/jpegxlconvert
Why bother?
Most "online converters" answer that by uploading your image to their server. For a personal photo, that's a lot of trust for a format conversion. I wanted the opposite: the file never leaves your device.
How it works
