To optimize JPEG XL images, run npx optimo image.jxl. Optimo applies format-specific ImageMagick-powered compression that typically reduces JPEG XL file size by 15–40% without visible quality loss. The original file is kept if the output is not smaller.

Command

Start here. Run optimo on an image file:

npx optimo image.jxl

Tip: add --dry-run to preview changes.

When to use JPEG XL

  • archival
  • high-fidelity images
  • future-friendly workflows

Trade-offs

  • Browser support is limited
  • Not a safe default for delivery

Related formats

PNG
Lossless image format with sharp edges and great support for transparency.
JPEG
The classic photo format: widely supported, good quality-to-size for photographs.
WebP
Modern image format with great compression and broad browser support.
AVIF
High-compression modern image format that can beat WebP on size at similar quality.
HEIC
A common camera output format (especially Apple devices) with efficient compression.
GIF
Legacy animated image format that is still widely used for simple loops.
SVG
Vector format: crisp at any size and excellent for icons and illustrations.

Related conversions

Convert PNG to JPEG XL
Convert JPEG to JPEG XL
Convert WebP to JPEG XL
Convert AVIF to JPEG XL
Convert HEIC to JPEG XL
Convert JPEG XL to PNG
Convert JPEG XL to JPEG
Convert JPEG XL to WebP

More for JPEG XL

Compress JPEG XL
Resize JPEG XL
What is JPEG XL?

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Frequently asked questions

How do I optimize JPEG XL files? Run "npx optimo image.jxl" in your terminal. Optimo applies format-specific ImageMagick-powered compression that reduces JPEG XL file size while preserving quality. The original file is kept if the optimized output is not smaller.

Is JPEG XL optimization lossless? By default, optimo uses lossless optimization for JPEG XL. For additional compression, add the --lossy flag to allow minor quality trade-offs for significantly smaller files.

What tools does optimo use for JPEG XL? Optimo uses ImageMagick, MozJPEG, and SVGO (depending on format) under the hood with format-specific settings tuned for JPEG XL files.