How to open .JXL files on Linux
To open .JXL files on Linux, open the file in Krita via File → Open (Krita supports JPEG XL).
Step-by-step instructions
- Open the file in Krita via File → Open (Krita supports JPEG XL).
- If your file manager doesn’t offer a good default, right-click → Open With → choose Krita; ensure your system MIME database is up to date (shared-mime-info is what many desktops use for extension/MIME mapping).
- If needed for compatibility, export to PNG or JPEG from the app that opened it.
Common issues
The file won’t open in the default photo viewer
Many built-in viewers don’t support JPEG XL by default, so double-clicking may fail or show an “unknown format” error.
- Open the file in Krita (File → Open), which documents JPEG XL support.
- If you must use a non-supporting viewer, export/convert the image to PNG or JPEG from a JPEG XL-capable app.
“Open with” doesn’t show a suitable app (Linux)
Desktop “Open With” menus often depend on shared MIME mappings; if the MIME database is outdated, .jxl may not be recognized properly.
- Try opening from inside Krita first (File → Open).
- Update your system’s MIME information/packages (shared-mime-info is the common database used by Linux desktops) so .jxl maps cleanly to image/jxl.
The image opens but looks wrong or fails to decode
A corrupted/incomplete download or a decoder bug can cause failed decoding or visual artifacts.
- Re-download or re-copy the file to ensure it’s complete.
- Try a different JPEG XL-capable tool/version (for example, a newer build of the app), then re-export to a more widely-supported format if needed.
Security note
JPEG XL is an image format (not a script/macro container), but malformed image files can still exploit bugs in decoders—avoid opening unknown .jxl files in rarely-updated software.