Convert JPG to JXL
JPEG XL is useful when your workflow already supports JXL: Safari users, image archives, lossless JPEG recompression experiments, and teams testing next-generation formats. It is not yet a universal web delivery format, so FastEdit keeps this conversion explicit: create a JXL locally, and keep JPG or WebP fallbacks for broad sharing.
How to finish the conversion
- 01
Open FastEdit
Navigate to app.fastedit.net.
- 02
Import your JPG
Drag and drop your .jpg or .jpeg file.
- 03
Select JXL output
Choose JPEG XL (JXL) from the format picker.
- 04
Choose mode
Select lossless JPEG recompression (bit-identical round-trip, ~20% smaller) or lossy re-encode (~60% smaller with minor quality change).
- 05
Export
Download your .jxl file. All encoding runs locally via WebAssembly.
Benefits
- Lossless JPEG recompression reduces JPG files by ~20% with a bit-exact round-trip: the original JPG can be perfectly reconstructed.
- Lossy JXL achieves ~60% smaller files than JPEG at the same visual quality.
- JXL supports progressive decoding, HDR, wide gamut, and up to 32-bit depth.
- Useful for archives and controlled workflows where every viewer or processor is known to support JPEG XL.
- No upload: all encoding happens on your device.
Switch formats in the browser, then download the version that actually fits.
Convert in FastEdit