CREOLE vs OPML
A detailed comparison of Creole Markup and OPML Outline — file size, quality, compatibility, and which format to choose for your workflow.
Creole Markup
Documents & TextCreole is a standardized wiki markup language intended to be a common baseline across different wiki engines. It defines a core set of formatting rules that all compliant wikis should support, reducing the learning curve when switching between wiki platforms.
About CREOLE filesOPML Outline
Documents & TextOPML (Outline Processor Markup Language) is an XML format for structured outlines and lists. It is most widely used for exchanging RSS feed subscription lists between podcast apps and feed readers, and for hierarchical note-taking.
About OPML filesStrengths Comparison
CREOLE Strengths
- Cross-wiki interop goal.
- Simple syntax.
- Formally specified.
OPML Strengths
- Standard RSS subscription interchange format.
- Simple XML — easy to parse and generate.
- Highly extensible via arbitrary attributes.
- Supported by every major outline and RSS tool.
Limitations
CREOLE Limitations
- Nobody adopted it as primary.
- Tiny ecosystem.
- Zero momentum in 2026.
OPML Limitations
- XML verbosity — larger than a JSON-based equivalent.
- Specification is loose — different tools disagree on edge cases.
- Primary use (RSS reading) has shrunk dramatically since Google Reader.
- No strong central stewardship.
Technical Specifications
| Specification | CREOLE | OPML |
|---|---|---|
| MIME type | text/x-creole | text/x-opml |
| Extension | .creole | .opml |
| Standard | Wiki Creole 1.0 (2007) | OPML 2.0 (2006) |
| Status | Historical | — |
| Format | — | XML with nested <outline> elements |
| Primary use | — | RSS subscription interchange |
Typical File Sizes
CREOLE
- Wiki page source 2-20 KB
OPML
- Typical RSS reader export (50 feeds) 5-30 KB
- Deep outline (Scrivener novel plan) 20-200 KB
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Frequently Asked Questions
CREOLE (Creole Markup) is a document format used to store paginated text, with optional formatting, tables, images, hyperlinks, headers and footers. It sits in the documents & text family and is typically associated with a specific office suite or publishing pipeline that defined the format and ships the canonical reader.
OPML (OPML Outline) is a document format used to store paginated text, with optional formatting, tables, images, hyperlinks, headers and footers. It sits in the documents & text family and is typically associated with a specific office suite or publishing pipeline that defined the format and ships the canonical reader.
Modern office suites — Microsoft Word, Google Docs, LibreOffice Writer, Apple Pages — open most CREOLE files with reasonable fidelity. If your installed software does not support CREOLE, convert to DOCX or PDF first using KaijuConverter; both open in virtually every reader, including free online viewers.
Modern office suites — Microsoft Word, Google Docs, LibreOffice Writer, Apple Pages — open most OPML files with reasonable fidelity. If your installed software does not support OPML, convert to DOCX or PDF first using KaijuConverter; both open in virtually every reader, including free online viewers.
Upload the CREOLE to KaijuConverter and pick DOCX, PDF, ODT, RTF, HTML, Markdown, or plain text. Our pipeline runs LibreOffice headlessly plus pandoc for text formats — the same engines behind professional document pipelines. Styles, tables, images, and hyperlinks survive the conversion intact.
Yes, to a high degree. Standard fonts, headings, lists, tables, images, hyperlinks and page structure transfer cleanly. Custom fonts substitute to the closest match if not embedded; obscure layout features unique to CREOLE (frames, legacy macros) may flatten to static content in the target format.