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MD at a glance
MD
Markdown was created in 2004 by John Gruber with Aaron Swartz, but the later CommonMark effort became important because the original syntax description was too ambiguous to keep implementations aligned.
JXR at a glance
JXR
JPEG XR grew from Microsoft's HD Photo work and then moved through standards bodies, but it remained much more niche than formats such as JPEG, PNG, or later AVIF/WebP families.
Format comparison
| Feature | MD | JXR |
|---|---|---|
| File type | Document | Image |
| Extensions |
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| MIME type |
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| Created year | 2004 | 2009 |
| Inventor | John Gruber and Aaron Swartz | Microsoft |
| Status | active | active |
| Primary use cases |
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| Vector scaling | Not supported | Not supported |
When to use each format
When to use MD
- Your source file is already in MD.
- Preserve source expectations before exporting to JXR.
- MD is commonly used in document workflows.
When to use JXR
- Your target workflow expects JXR.
- Improve delivery compatibility with JXR.
- JXR is commonly used in image workflows.
FAQs
Why convert MD to JXR?
Convert to JXR when the receiving environment explicitly expects JPEG XR or when recovering historical assets from that ecosystem.
For broader distribution, TIFF, PNG, AVIF, or WebP are usually easier choices.
What changes when converting MD to JXR?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting MD to JXR?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.