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
STRUCTURED DATA
RB to Open Package Format Converter — Free, Online, No Signup
Convert RB files to Open Package Format online with no signup required.
RB at a glance
RB
Legacy ebook formats like RB reflect a time when hardware vendors and reading platforms were all experimenting with their own content containers.
Open Package Format at a glance
Open Package Format
OPF began in the Open eBook era, evolved through IDPF EPUB specifications such as OPF 2.0.1, and is now carried forward by the W3C EPUB package-document model.
Format comparison
| Feature | RB | Open Package Format |
|---|---|---|
| File type | Ebook | Other |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 1998 | 1999 |
| Inventor | NuvoMedia | International Digital Publishing Forum (IDPF) |
| Status | active | active |
| Primary use cases |
|
|
| Reflowable text | Supported | Supported |
| Structured data | Not supported | Supported |
When to use each format
When to use RB
- Your source file is already in RB.
- Preserve source expectations before exporting to Open Package Format.
- RB is commonly used in ebook workflows.
When to use Open Package Format
- Your target workflow expects Open Package Format.
- Improve delivery compatibility with Open Package Format.
- Open Package Format is commonly used in other workflows.
FAQs
Why convert RB to Open Package Format?
EPUB ebook package authoring, ebook metadata management, and ebook production pipelines that generate or process EPUB package documents.
What changes when converting RB to Open Package Format?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to Open Package Format adds structured data.
What should I review after converting RB to Open Package Format?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.