MIME Database / Compare Formats / JPEG-XR-HEIF vs JXL

JPEG-XR-HEIF vs JXL Format Comparison

JPEG-XR-HEIF

JPEG XR Image (HEIF Container)

image/jxra

JPEG XL

image/jxl

JXL

A complete technical comparison of JPEG XR Image (HEIF Container) and JPEG XL — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

JXL wins on browser support

Feature Support

Feature	JPEG-XR-HEIF	JXL
Transparency (Alpha)	Yes	Yes
Animation Support	✕ No	Yes
Progressive Loading	Yes	Yes
HDR Support	Yes	Yes
EXIF Metadata	Yes	Yes
ICC Color Profile	Yes	Yes

JPEG XR Image (HEIF Container)

image/jxra

Extension

.jxra

Container HEIF / ISOBMFF (ISO/IEC 23008-12 / Annex F of ITU-T T.832)

Compression Lossy / Lossless

Algorithm

JPEG XR (Lapped Biorthogonal Transform)

Color Depth 8-bit, 16-bit, 32-bit (Float)

Developed by ISO/IEC JTC 1 / ITU-T

Released 2019

Magic Bytes

XX XX XX XX 66 74 79 70 6A 78 72 41

Full JPEG-XR-HEIF reference →

JPEG XL

image/jxl

Extension

.jxl

Container ISOBMFF / JPEG XL Codestream

Compression Lossy (VarDCT) / Lossless (Modular)

Algorithm

VarDCT (Variable block-size DCT)Modular (Predictive coding for lossless)

Color Depth 8-bit, 10-bit, 12-bit, 16-bit, 32-bit (Float)

Developed by Joint Photographic Experts Group (JPEG)

Released 2021

Magic Bytes

FF 0A (Codestream) / 00 00 00 0C 4A 58 4C 20 0D 0A 87 0A (Container)

Full JXL reference →

Browser Support Comparison

Browser	JPEG-XR-HEIF	JXL
Chrome	✕	✕
Firefox	✕	✕
Safari	✕	✓ 17+
Edge	✕	✕
IE (Legacy)	✕	✕

JPEG-XR-HEIF

JPEG-XR-HEIF Strengths

Combines the deep color (32-bit float) and mathematically lossless compression of JPEG XR with the robust metadata architecture of HEIF
Allows grouping multiple images, exposure brackets, or focal stacks into a single file collection

Limitations

Practically non-existent software and operating system support compared to standard HEIC or legacy JPEG XR (.jxr)
Zero web browser support, rendering it entirely unsuitable for public web deployment
Eclipsed by modern standards like AVIF and JPEG XL which offer superior compression with much broader industry backing

JXL

JXL Strengths

Capable of losslessly recompressing legacy JPEG files, saving ~20% space while retaining perfect byte-for-byte restorability
Highly superior progressive decoding (Saliency-driven), allowing recognizable images to load extremely fast on slow connections
Outperforms WebP and competes favorably with AVIF, especially at high-fidelity settings and for complex textures/photography
Royalty-free with an open-source reference implementation (libjxl)

Limitations

Google's removal of JXL support from Chrome severely hindered its adoption as a universal web standard
Lack of hardware decoding chips compared to video-derived codecs like AVIF (AV1)
File parsing logic is complex due to the split between raw codestreams and ISOBMFF containers