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BPG to NCX Converter — Free, Online, No Signup
Convert BPG files to NCX online with no signup required.
BPG at a glance
BPG
BPG arrived in the mid-2010s when image engineers were looking for better post-JPEG compression before AVIF and JPEG XL had ecosystem momentum.
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 | BPG | NCX |
|---|---|---|
| File type | Image | Other |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 2014 | 2005 |
| Inventor | Fabrice Bellard | DAISY Consortium |
| Status | active | active |
| Transparency | Not supported | Not supported |
| Animation | Supported | Not supported |
| Primary use cases |
|
|
| Vector scaling | Not supported | Not supported |
| Streaming ready | Not supported | Not supported |
When to use each format
When to use BPG
- Your source file is already in BPG.
- Preserve source expectations before exporting to NCX.
- BPG is commonly used in image 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 BPG 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 BPG to NCX?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to NCX removes animation support.
What should I review after converting BPG to NCX?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.