CONVERT
OPML → ADOC
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Fast, secure OPML to ADOC conversion. No registration required.
Setup: OPML is a document format oriented around a particular office suite or publishing pipeline. Goal: an interchangeable ADOC. Move a document from OPML into ADOC while keeping structure and formatting intact. ADOC is usually the better target when you need to email, sign, archive or hand the file to a tool that does not natively parse OPML. Conversion happens server-side in seconds and both files delete automatically. One more beat. OPML is a document format oriented around a particular office suite or publishing pipeline. Receiving format: ADOC is a document format oriented around a particular office suite or publishing pipeline.
OPML Outline
Source formatOPML (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.
AsciiDoc
Target formatAsciiDoc is a human-readable markup language designed for writing technical documentation, articles, and books. It supports rich formatting including tables, admonitions, cross-references, and can be converted to HTML, PDF, EPUB, and DocBook.
Why convert OPML to ADOC
The driver for a OPML to ADOC conversion is almost always the downstream audience: the editor, archivist, signer or reader who expects a ADOC. Doing the conversion in a proper rendering pipeline, rather than hoping the receiving tool will figure it out, avoids layout drift and font substitutions.
HOW TO CONVERT
OPML → ADOC
Provide the document
Select a OPML file. Very large documents (100+ pages) may take a few extra seconds to render completely.
Render to ADOC
LibreOffice plus supporting filters translate the OPML into a fully-formed ADOC with no structural drift.
Save the result
The converted ADOC streams back over HTTPS; open in the target application to verify formatting.
Common Use Cases
Share across platforms
Send ADOC files to anyone without worrying about whether they have the right software for OPML.
Embed in documents
Drop ADOC output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
ADOC often produces smaller files than OPML for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
OPML vs ADOC — Strengths and limitations
What each format does best, and where it falls short.
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
- 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.
ADOC Strengths
- Expressiveness of DocBook in plain text.
- Cross-references, tables, bibliographies, math, and metadata native.
- Multi-output: HTML, PDF, EPUB, man pages, DocBook XML.
- Faster parsing than LaTeX, richer than Markdown.
- Eclipse Foundation stewardship.
Limitations
- Steeper learning curve than Markdown.
- Smaller ecosystem than Markdown despite being more capable.
- Most CI tools default to Markdown, not AsciiDoc.
OPML vs ADOC — Technical specifications
Side-by-side comparison of the technical details.
OPML
- MIME type
- text/x-opml
- Extension
- .opml
- Format
- XML with nested <outline> elements
- Standard
- OPML 2.0 (2006)
- Primary use
- RSS subscription interchange
ADOC
- MIME type
- text/asciidoc
- Extensions
- .adoc, .asciidoc, .asc
- Processors
- AsciiDoc (Python), Asciidoctor (Ruby)
- Stewardship
- Eclipse AsciiDoc Working Group
- Output targets
- HTML, PDF, EPUB, DocBook, man page
| Specification | OPML | ADOC |
|---|---|---|
| MIME type | text/x-opml | text/asciidoc |
| Extension | .opml | — |
| Format | XML with nested <outline> elements | — |
| Standard | OPML 2.0 (2006) | — |
| Primary use | RSS subscription interchange | — |
| Extensions | — | .adoc, .asciidoc, .asc |
| Processors | — | AsciiDoc (Python), Asciidoctor (Ruby) |
| Stewardship | — | Eclipse AsciiDoc Working Group |
| Output targets | — | HTML, PDF, EPUB, DocBook, man page |
OPML vs ADOC — Typical file sizes
Approximate file sizes for common scenarios.
OPML
- Typical RSS reader export (50 feeds) 5-30 KB
- Deep outline (Scrivener novel plan) 20-200 KB
ADOC
- Short technical article 2-20 KB
- Book chapter 20-150 KB
- Full book source 500 KB - 5 MB
Quality & Compatibility
The conversion preserves document structure rather than pixel-perfect rendering: a paragraph in OPML is a paragraph in ADOC, not a bitmap snapshot. That means you can still edit and search the ADOC. If you need exact visual fidelity (for legal or print workflows), export to PDF as the final step.
Tips for Best Results
- Run a spell-check in the ADOC after conversion — occasionally hyphenation or language tagging shifts and typos become invisible to the original checker.
- Include fallback generic fonts (sans-serif, serif) in your style definitions so the ADOC degrades gracefully when a font is missing on a viewer device.
- For archive-quality output, export to PDF/A after converting to ADOC; this locks the document against future rendering drift.
Frequently Asked Questions
Yes, as long as the fonts are standard (system fonts or common office fonts like Arial, Calibri, Times, Helvetica). Custom corporate fonts survive if they are embedded in the source document; otherwise the conversion substitutes the closest available match, which can shift line breaks by a character or two.
Yes. Inline images are embedded into the ADOC at full resolution, editable tables become native ADOC tables, and hyperlinks keep their URLs. Complex features unique to OPML — macros, form fields, track-changes — are mapped where an equivalent exists in ADOC and flattened into static content otherwise.
All uploads go over TLS, files are processed in isolated containers and both the source and the output are deleted within two hours. No account is required, file contents are never indexed or used for training, and the paid plan adds a signable data-processing agreement for regulated workflows.
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