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cjxl — Compress images to JPEG XL. Accepted input extensions are PNG, APNG, GIF, JPEG, EXR, PPM, PFM, PAM,

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandcjxlacceptedimagesjpegcliinputcompress

Problem

How to use the cjxl command: Compress images to JPEG XL. Accepted input extensions are PNG, APNG, GIF, JPEG, EXR, PPM, PFM, PAM, PGX, and JXL. More information: <https://github.com/libjxl/libjxl/blob/main/doc/man/cjxl.txt>.

Solution

cjxl — Compress images to JPEG XL. Accepted input extensions are PNG, APNG, GIF, JPEG, EXR, PPM, PFM, PAM, PGX, and JXL. More information: <https://github.com/libjxl/libjxl/blob/main/doc/man/cjxl.txt>.

Convert an image to JPEG XL:

cjxl {{path/to/image.ext}} {{path/to/output.jxl}}

Set quality to lossless and maximize compression of the resulting image:

cjxl --distance 0 --effort 9 {{path/to/image.ext}} {{path/to/output.jxl}}

Display an extremely detailed help:

cjxl {{[-h -v -v -v -v|--help --verbose --verbose --verbose --verbose]}}

Code Snippets

Convert an image to JPEG XL

cjxl {{path/to/image.ext}} {{path/to/output.jxl}}

Set quality to lossless and maximize compression of the resulting image

cjxl --distance 0 --effort 9 {{path/to/image.ext}} {{path/to/output.jxl}}

Display an extremely detailed help

cjxl {{[-h -v -v -v -v|--help --verbose --verbose --verbose --verbose]}}

Context

tldr-pages: common/cjxl

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