Convert JPEG to JPEG XL

A practical, local workflow for converting JPEG to JPEG XL with optimo.

Last updated: 2026-03-18

To convert JPEG to JPEG XL, run npx optimo photo.jpg --format jxl. JPEG XL can improve compression while keeping high visual quality. Optimo handles format conversion and optimization in a single step.

Command

Convert a file by targeting the output format:

npx optimo photo.jpg --format jxl

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

Why convert?

  • JPEG XL can improve compression while keeping high visual quality.
  • Useful when you want a high-quality master before creating web files.

Format notes

JPEG
The classic photo format: widely supported, good quality-to-size for photographs.
Optimize JPEGCompress JPEGResize JPEGJPEG guide
JPEG XL
Next-gen image format designed for high quality and efficient compression.
Optimize JPEG XLCompress JPEG XLResize JPEG XLJPEG XL guide

More from JPEG

JPEG → WebPJPEG → AVIFJPEG → PNGJPEG → HEICJPEG → GIF

More to JPEG XL

PNG → JPEG XLWebP → JPEG XLAVIF → JPEG XLHEIC → JPEG XLGIF → JPEG XL

Frequently asked questions

How do I convert JPEG to JPEG XL?
Run "npx optimo photo.jpg --format jxl" in your terminal. Optimo handles the format conversion and applies optimization in a single step.
Why convert JPEG to JPEG XL?
JPEG XL can improve compression while keeping high visual quality. Useful when you want a high-quality master before creating web files.
Does converting JPEG to JPEG XL lose quality?
Optimo uses sensible defaults that balance file size and quality. For lossless conversion (where possible), omit the --lossy flag. Add --dry-run to preview the result before committing.