Image MIME Reference
JPEG-XR-(HEIF)
JPEG XR Image (HEIF Container)
image/jxra
VS
JPEG XS Image Sequence (HEIF Container)
image/jxss
JPEG-XS-Sequence
A complete technical comparison of JPEG XR Image (HEIF Container) and JPEG XS Image Sequence (HEIF Container) — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.
Equal browser support
Feature Support
| Feature | JPEG-XR-(HEIF) | JPEG-XS-Sequence |
|---|---|---|
| Transparency (Alpha) | Yes | Yes |
| Animation Support | ✕ No | Yes |
| Progressive Loading | Yes | ✕ No |
| 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
JPEG XS Image Sequence (HEIF Container)
image/jxss
Extension
.jxss.jxs
Container
HEIF / ISOBMFF (ISO/IEC 23008-12)
Compression
Lossy (Visually Lossless) / Mathematically Lossless
Algorithm
JPEG XS (ISO/IEC 21122-1)
Color Depth
8-bit, 10-bit, 12-bit, 14-bit, 16-bit
Developed by
Joint Photographic Experts Group (JPEG)
Released
2019
Magic Bytes
XX XX XX XX 66 74 79 70 6A 78 73 73
Browser Support Comparison
| Browser | JPEG-XR-(HEIF) | JPEG-XS-Sequence |
|---|---|---|
Chrome
|
✕ | ✕ |
Firefox
|
✕ | ✕ |
Safari
|
✕ | ✕ |
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
JPEG-XS-Sequence
JPEG-XS-Sequence Strengths
- Provides sub-millisecond encoding and decoding latency across a video sequence while retaining visually lossless quality
- Leverages the robust ISOBMFF track structures for accurate frame timing, audio synchronization, and metadata handling
- Optimized for professional video production and IP broadcasting workflows
Limitations
- Zero web browser compatibility, limiting its use entirely to professional and industrial hardware workflows
- Compression ratios are significantly lower than consumer video codecs like HEVC or AV1
- Extremely niche format that requires highly specialized broadcast hardware or custom software libraries to process
When to choose which format
JPEG-XR-(HEIF)
Use JPEG-XR-(HEIF) when…
- Specialized Archival
- Experimental Imaging Workflows
- High Dynamic Range (HDR) Imaging
JPEG-XS-Sequence
Use JPEG-XS-Sequence when…
- Live Broadcast Video Snippets
- Medical Imaging Sequences
- HDR Burst Photography Archiving
- Automotive & Drone Video Storage