Image MIME Reference
JPEG-XS-Codestream
JPEG XS Codestream
image/jxsc
VS
Extended Image File Format
image/vnd.xiff
XIFF
A complete technical comparison of JPEG XS Codestream and Extended Image File Format — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.
Equal browser support
Feature Support
| Feature | JPEG-XS-Codestream | XIFF |
|---|---|---|
| Transparency (Alpha) | Yes | ✕ No |
| Animation Support | ✕ No | ✕ No |
| Progressive Loading | ✕ No | ✕ No |
| HDR Support | Yes | ✕ No |
| EXIF Metadata | ✕ No | ✕ No |
| ICC Color Profile | ✕ No | ✕ No |
JPEG XS Codestream
image/jxsc
Extension
.jxsc.jxs
Container
None (Raw Codestream)
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) / intoPIX
Released
2019
Magic Bytes
FF 10
Extended Image File Format
image/vnd.xiff
Extension
.xif
Container
TIFF-based Proprietary Container
Compression
CCITT Group 3 / Group 4 / LZW / Uncompressed
Algorithm
CCITT Group 4LZWNone
Color Depth
1-bit (Monochrome), 8-bit (Grayscale), 24-bit (RGB)
Developed by
Keyfile Corporation
Released
1994
Magic Bytes
49 49 2A 00 or 4D 4D 00 2A
Browser Support Comparison
| Browser | JPEG-XS-Codestream | XIFF |
|---|---|---|
Chrome
|
✕ | ✕ |
Firefox
|
✕ | ✕ |
Safari
|
✕ | ✕ |
Edge
|
✕ | ✕ |
IE (Legacy)
|
✕ | ✕ |
JPEG-XS-Codestream
JPEG-XS-Codestream Strengths
- Eliminates container overhead, maximizing parsing speed and minimizing latency to fractions of a millisecond
- Highly optimized for direct hardware implementation in FPGAs and ASICs
- Perfect for continuous data streaming over IP networks without needing to establish file headers
Limitations
- Lacks standard container metadata (EXIF, XMP, ICC profiles), meaning color space and orientation data must be handled externally or out-of-band
- Zero support in web browsers or standard consumer operating systems
- Often requires specialized broadcast hardware or custom software libraries to decode
XIFF
XIFF Strengths
- Pioneered early enterprise document workflow integration by binding administrative routing data directly to the document image file
- Leveraged efficient fax compression standards to keep storage requirements low on 1990s server infrastructure
Limitations
- Completely proprietary and obsolete; Keyfile Corporation's software ecosystem no longer exists
- Causes widespread MIME type identification conflicts due to sharing the exact same binary header signature as standard TIFF files
- Zero support in modern operating systems or web browsers
When to choose which format
JPEG-XS-Codestream
Use JPEG-XS-Codestream when…
- Hardware Decoding Pipelines (FPGA/ASIC)
- Live Broadcast Infrastructure
- Video over IP Transport
- Embedded Camera Systems
XIFF
Use XIFF when…
- Keyfile Enterprise Document Management
- Legacy Corporate Workflow Archival
- Scanned Multi-page Document Routing