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NCX at a glance
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.
KMZ at a glance
KMZ
Convert to KMZ when a KML-based map needs embedded images, icons, or overlays to move together as one deliverable.
It is the right target for portable Google Earth projects, offline map bundles, and shareable geospatial packages that recipients should be able to open without relinking external resources.
Format comparison
| Feature | NCX | KMZ |
|---|---|---|
| File type | Other | Other |
| Extensions |
|
|
| MIME type |
|
|
| Compression / quality | depends | depends |
| File size characteristics | depends | depends |
| Compatibility | moderate | moderate |
| Editability | moderate | moderate |
| Created year | 2005 | 2005 |
| Inventor | DAISY Consortium | |
| Status | active | active |
| Transparency | Not supported | Not supported |
| Animation | Not supported | Not supported |
| Primary use cases |
|
|
| Common software |
|
|
| Archival suitability | moderate | moderate |
| Metadata handling | moderate | moderate |
| Delivery profile | moderate | moderate |
| Workflow fit | exchange | exchange |
| Vector scaling | Not supported | Not supported |
| Reflowable text | Supported | Not supported |
| Structured data | Supported | Supported |
| Streaming ready | Not supported | Not supported |
When to use each format
When to use NCX
- system exchange
- automation
- specialized interoperability
- Provides a dedicated hierarchical navigation tree for legacy ebook systems.
When to use KMZ
- system exchange
- automation
- specialized interoperability
- Convenient for sharing KML plus supporting assets together.
FAQs
Why convert NCX to KMZ?
Convert to KMZ when a KML-based map needs embedded images, icons, or overlays to move together as one deliverable.
It is the right target for portable Google Earth projects, offline map bundles, and shareable geospatial packages that recipients should be able to open without relinking external resources.
What changes when converting NCX to KMZ?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to KMZ removes reflowable text.
What should I review after converting NCX to KMZ?
Check the exported file for Still inherits KML's presentation-oriented trade-offs.; Not the most developer-friendly target for API-centric geospatial workflows..