JPEG XL

File Format
Name	JPEG XL
Ontology	Electronic File Formats Graphics JPEG XL
Extension(s)	.jxl
Released	2019 (draft)

JPEG XL is a work-in-progress compressed image format and/or file format that is yet another attempt to be the next JPEG. It was first announced around 2017-08. It is expected to be published as ISO/IEC 18181.

Identification

Based on draft information, JPEG XL is technically defined as a union of three different top-level formats:

• Normal JPEG XL files, which start with bytes ff 0a.
• Lossless JPEG1 recompressed files, which start with 0a 04 42 d2 d5 4e (see Brunsli).
• Most standard JPEG files, which start with ff d8 ff e0.

Specifications

• Committee Draft of JPEG XL (2019-08)
• ISO/IEC 18181

Software

• Open-source reference software
• JPEG ↔ JPEG XL transcoder

Links

• Overview of JPEG XL
• Next-Generation Image Compression (JPEG XL) Draft Call for Proposals (2017-11)
• Revised Draft Call for Proposals (2018-02)
• Final Call for Proposals (2018-04)
• Gigazine article (2017-08-15)
• Slides from Imagecon 2019 presentation
• Introductory paper (open access)