jxlinfo

jxlinfo [-v] [-h] INPUT

jxlinfo prints information about JPEG XL (.jxl) image files by parsing the codestream header without performing a full decode. It reports image dimensions, bit depth, color encoding (including ICC profile presence), animation properties, and container box structure.The tool is part of libjxl-tools, the reference implementation distribution for JPEG XL maintained by the JPEG XL Project. It is commonly used to verify that a file is a valid JPEG XL codestream, to inspect encoding parameters before decoding, and to debug encoder output.In verbose mode, jxlinfo prints additional details such as frame headers, extra channels, animation timing, and intensity target. The non-verbose mode is suitable for scripting where a brief summary is needed.

-v, --verbose

Produce more verbose output, including detailed bitstream and frame information.

Display the help message listing all available options and exit.

One or more input JPEG XL image filenames to inspect.

Output format is not stable across versions of libjxl and should not be parsed by scripts that depend on exact field names. The tool inspects only the codestream header; it does not validate that the file can be decoded without errors. For full decoding, use djxl(1).

jxlinfo ships with libjxl, the reference implementation of the JPEG XL image coding system developed by the JPEG XL Project and contributors from Google, Cloudinary, and others. JPEG XL was standardized as ISO/IEC 18181 starting in 2021. The tool is packaged in libjxl-tools on Debian, Ubuntu, Fedora, and other distributions.

djxl(1), cjxl(1), identify(1), exiftool(1)