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MD to NCX Converter — Free, Online, No Signup
Convert MD files to NCX online with no signup required.
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.
NCX at a glance
NCX
NCX was defined in the 2005 DAISY and ANSI-NISO talking-book standard, then carried forward into EPUB 2 and later treated as a legacy compatibility feature once EPUB 3 introduced XHTML navigation documents.
Format comparison
| Feature | MD | NCX |
|---|---|---|
| File type | Document | Other |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 2004 | 2005 |
| Inventor | John Gruber and Aaron Swartz | DAISY Consortium |
| Status | active | active |
| Primary use cases |
|
|
| Vector scaling | Not supported | Not supported |
| Reflowable text | Not supported | Supported |
| Structured data | Supported | Supported |
When to use each format
When to use MD
- Your source file is already in MD.
- Preserve source expectations before exporting to NCX.
- MD is commonly used in document workflows.
When to use NCX
- Your target workflow expects NCX.
- Improve delivery compatibility with NCX.
- NCX is commonly used in other workflows.
FAQs
Why convert MD to NCX?
Convert to NCX when an ebook workflow needs a legacy-compatible navigation map for EPUB 2 readers or for EPUB 3 packages that must still support older reading systems.
It is useful in production pipelines where table-of-contents structure needs to survive across mixed generations of ebook software.
What changes when converting MD to NCX?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to NCX adds reflowable text.
What should I review after converting MD to NCX?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.