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Decode JPEG XL images (.jxl) to PNG or JPEG. Use when you need to convert JXL files back to standard formats for compatibility, display, or further editing.
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Convert images to JPEG XL format (.jxl) with quality presets (lossless, visually lossless, or web). Use when you want optimal compression for photo archival or long-term storage, especially from JPEG originals where lossless transcoding preserves the original bitstream at smaller file size.
| name | from-jxl |
| description | Decode JPEG XL images (.jxl) to PNG or JPEG. Use when you need to convert JXL files back to standard formats for compatibility, display, or further editing. |
| disable-model-invocation | false |
| allowed-tools | Bash(djxl *), Bash(ls *), Bash(find *), Bash(mkdir *), Bash(rm *), Read, Write |
Extract images from JPEG XL (.jxl) files using djxl. Outputs PNG or JPEG, with optional recovery of original JPEG bitstream if the source JXL was a lossless JPEG transcode.
djxl --jpeg.png (default) or jpeg. If the user has a JXL that came from a lossless JPEG transcode and wants to recover the original JPEG byte-exact, offer the jpeg format and explain the --jpeg flag.command -v djxl || echo "djxl not installed — install with: sudo apt install libjxl-tools"
Abort if missing.
.jxl files.find to locate .jxl files in the tree.Confirm the output format with the user.
Single file to PNG (default):
djxl input.jxl output.png
Single file to JPEG (standard):
djxl input.jxl output.jpg
Single file to original JPEG (lossless transcode recovery):
If the JXL was created via cjxl in.jpg out.jxl, this recovers the original JPEG bitstream byte-exact:
djxl --jpeg input.jxl recovered.jpg
Batch (folder or recursive):
find <target> -maxdepth <1|999> -type f -iname '*.jxl' \
-exec djxl {} {.}.<format> \;
(Replace <format> with png or jpg, or —jpeg flag for JPEG recovery.)
After decoding:
.jxl files remain unchanged.djxl --jpeg if you are confident the .jxl source was created via lossless JPEG transcode (i.e., cjxl original.jpg encoded.jxl). For JXL files created from PNG or other sources, --jpeg may produce incorrect results.djxl preserves them in the output.apt install libjxl-tools.