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STRUCTURED DATA
Open Package Format Converter
Convert Open Package Format files with ConverterHQ using workflows tuned for other compatibility, predictable output, and practical downstream use.
Quality and compatibility profile
Core technical and historical facts used for conversion quality, compatibility decisions, and SEO uniqueness.
| Feature | Fact sheet |
|---|---|
| Category | STRUCTURED DATA |
| Extensions | opf |
| MIME types | application/oebps-package+xml |
| Created | 1999 |
| Inventor | International Digital Publishing Forum (IDPF) |
| Status | active |
| Xml Based | ✅ |
| Epub Package Document | ✅ |
| Metadata Container | ✅ |
| Manifest And Spine | ✅ |
| Transparency support | ❌ |
| Animation support | ❌ |
| Layer support | ❌ |
| Vector scaling | ❌ |
| Reflowable text | ✅ |
| Multitrack content | ❌ |
| Camera raw data | ❌ |
| HDR content | ❌ |
| Structured data | ✅ |
| Streaming delivery | ❌ |
About this format
Open Package Format format context
Format: Open Package Format
Overview
OPF matters because EPUB and earlier Open eBook workflows needed a package document that could declare publication metadata, list resources in a manifest, and define the default reading order through a spine.
Ebook publishers needed one XML package file that could bind together publication metadata, content resources, and reading order for portable digital books.
OPF remains the package-document core of EPUB production, validation, conversion, and archive workflows even as surrounding EPUB features evolve.
Open Package Format is closely associated with W3C (formerly IDPF).
Open Package Format is usually selected for workflows that center on system exchange, automation, specialized interoperability.
Typical Workflows
- system exchange
- automation
- specialized interoperability
Common Software
- EPUB authoring tools
- EPUBCheck
- Calibre
- digital publishing pipelines
Strengths
- Centralizes metadata, manifest, and spine information for an EPUB publication.
- Provides the durable packaging model that ebook toolchains and validators expect.
- Carries forward across multiple generations of the EPUB ecosystem.
Limitations
- Useful only inside an ebook packaging workflow rather than as a general-purpose XML container.
- Compatibility details vary across EPUB 2, EPUB 3, and legacy-reading-system expectations.
Related Formats
- EPUB
- NCX
- XML
- HTML
Interesting Context
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.
EPUB ebook production ecosystem: Calibre, Sigil, Adobe InDesign EPUB export, and all ebook authoring tools.
OPF is a required component inside every EPUB ZIP container file.
Status: active. Introduced: 1999. Invented by: International Digital Publishing Forum (IDPF). Stewarded by: W3C (formerly IDPF).
How Open Package Format fits into workflows
Workflow role: Open Package Format
EPUB ebook package authoring, ebook metadata management, and ebook production pipelines that generate or process EPUB package documents.
History of Open Package Format
Format history: 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.
Original problem: Ebook publishers needed one XML package file that could bind together publication metadata, content resources, and reading order for portable digital books.
Why Open Package Format still matters
Current role: Open Package Format
OPF matters because EPUB and earlier Open eBook workflows needed a package document that could declare publication metadata, list resources in a manifest, and define the default reading order through a spine.
Modern role: OPF remains the package-document core of EPUB production, validation, conversion, and archive workflows even as surrounding EPUB features evolve.
When to use Open Package Format
- system exchange
- automation
- specialized interoperability
Advantages of Open Package Format
- Centralizes metadata, manifest, and spine information for an EPUB publication.
- Provides the durable packaging model that ebook toolchains and validators expect.
- Carries forward across multiple generations of the EPUB ecosystem.
Limitations of Open Package Format
- Useful only inside an ebook packaging workflow rather than as a general-purpose XML container.
- Compatibility details vary across EPUB 2, EPUB 3, and legacy-reading-system expectations.
Formats related to Open Package Format
Open Package Format technical profile
| Feature | Fact sheet |
|---|---|
| Category | other |
| Extensions | .opf |
| MIME types | application/oebps-package+xml |
| Created year | 1999 |
| Inventor | International Digital Publishing Forum (IDPF) |
| Status | active |
| xml_based | True |
| epub_package_document | True |
| metadata_container | True |
| manifest_and_spine | True |
| supports_transparency | False |
| supports_animation | False |
| supports_layers | False |
| supports_vector_scaling | False |
| supports_reflowable_text | True |
| supports_multitrack | False |
| camera_raw | False |
| hdr_capable | False |
| structured_data_capable | True |
| streaming_ready | False |
| sources | {'url': 'https://en.wikipedia.org/wiki/EPUB', 'title': 'Open Packaging Format', 'relevance': 'EPUB standard context', 'source_type': 'reference'}, {'url': 'https://www.w3.org/TR/epub-33/', 'title': 'EPUB 3 specification', 'relevance': 'Current specification', 'source_type': 'official'} |
Open Package Format quality and compatibility
Format profile: Open Package Format
Size profile: depends. Quality profile: depends. Editability profile: moderate. Compatibility profile: moderate. Archival profile: moderate. Metadata profile: moderate. Delivery profile: moderate. Workflow profile: exchange. Status: active.
Notable capabilities: reflowable text, structured data.
Software that opens Open Package Format
- EPUB authoring tools
- EPUBCheck
- Calibre
- digital publishing pipelines
Conversion options
Convert Open Package Format to
Convert to Open Package Format from
FAQs
Q: What is Open Package Format typically used for?
A:
Open Package Format is commonly used for system exchange, automation, specialized interoperability.
Q: What are the advantages of Open Package Format?
A:
Open Package Format is broadly compatible across common software.
Q: What should I watch out for when converting Open Package Format?
A:
Check output quality and compatibility on representative sample files.
Sources
EPUB standard context
Current specification