Convert anything, at global scale.
200+ formats and automation APIs that feels instant.
CONVERT
From
To
Drop files or choose a source
Upload multiple files at once, mix formats, and fine-tune every conversion with format-aware settings.
Max 2GB per file · Drag & drop ready · Mixed file types welcome
JSON at a glance
JSON
Convert to JSON when data needs to move between systems, APIs, scripts, and applications in a structured but broadly compatible format.
It is ideal for payloads, configuration, manifests, exports, and machine-readable documents that need to be easy to parse programmatically.
Use it when interoperability and structured automation matter more than comments or document-style readability.
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.
Format comparison
| Feature | JSON | NCX |
|---|---|---|
| File type | Other | Other |
| Extensions |
|
|
| MIME type |
|
|
| Compression / quality | depends | depends |
| File size characteristics | depends | depends |
| Compatibility | moderate | moderate |
| Editability | moderate | moderate |
| Created year | 2001 | 2005 |
| Inventor | Douglas Crockford | 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 | Not supported | Supported |
| Structured data | Supported | Supported |
| Streaming ready | Not supported | Not supported |
When to use each format
When to use JSON
- system exchange
- automation
- specialized interoperability
- Easy to parse across nearly every modern programming environment.
When to use NCX
- system exchange
- automation
- specialized interoperability
- Provides a dedicated hierarchical navigation tree for legacy ebook systems.
FAQs
Why convert JSON 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 JSON 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 JSON to NCX?
Check the exported file for Superseded by the EPUB navigation document in modern EPUB 3 workflows.; Primarily a compatibility concern outside legacy ebook processing..