CONVERT OPML → PDF (OPML to PDF)
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Studio Panel
Ghostscript + QPDFHOW TO CONVERT OPML → PDF
Provide the document
Select a OPML file. Very large documents (100+ pages) may take a few extra seconds to render completely.
Render to PDF
LibreOffice plus supporting filters translate the OPML into a fully-formed PDF with no structural drift.
Save the result
The converted PDF streams back over HTTPS; open in the target application to verify formatting.
Setup: OPML is a document format oriented around a particular office suite or publishing pipeline. Goal: an interchangeable PDF. Converting OPML to PDF online saves installing office suites you use once a year. Upload the document, let the server render it through the same pipeline large publishers use, and download a polished PDF that keeps its original structure and typography. A quick refresher — OPML is a document format oriented around a particular office suite or publishing pipeline. By contrast, PDF is Adobe's Portable Document Format, the fixed-layout standard for shareable documents.
Why convert OPML to PDF
The driver for a OPML to PDF conversion is almost always the downstream audience: the editor, archivist, signer or reader who expects a PDF. Doing the conversion in a proper rendering pipeline, rather than hoping the receiving tool will figure it out, avoids layout drift and font substitutions.
OPML vs PDF — 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
- MIME Type
- text/x-opml
- Category
- Documents & Text
- Full Name
- OPML Outline
- Conversion Engine
- PANDOC
- MIME type
- application/pdf
- Extension
- MIME Type
- application/pdf
- Category
- Documents & Text
- Full Name
- PDF Document
- Conversion Engine
- PANDOC
- Current version
- PDF 2.0 (ISO 32000-2:2020)
- Compression
- Flate, LZW, JBIG2, JPEG, JPEG 2000
- Max file size
- ~10 GB (practical); 2^31 bytes (theoretical per object)
- Color models
- RGB, CMYK, Grayscale, Lab, DeviceN, ICC-based
- Standard subsets
- PDF/A, PDF/X, PDF/UA, PDF/E, PDF/VT
| Specification | OPML | |
|---|---|---|
| MIME type | text/x-opml | application/pdf |
| Extension | .opml | |
| Format | XML with nested <outline> elements | — |
| Standard | OPML 2.0 (2006) | — |
| Primary use | RSS subscription interchange | — |
| MIME Type | text/x-opml | application/pdf |
| Category | Documents & Text | Documents & Text |
| Full Name | OPML Outline | PDF Document |
| Conversion Engine | PANDOC | PANDOC |
| Current version | — | PDF 2.0 (ISO 32000-2:2020) |
| Compression | — | Flate, LZW, JBIG2, JPEG, JPEG 2000 |
| Max file size | — | ~10 GB (practical); 2^31 bytes (theoretical per object) |
| Color models | — | RGB, CMYK, Grayscale, Lab, DeviceN, ICC-based |
| Standard subsets | — | PDF/A, PDF/X, PDF/UA, PDF/E, PDF/VT |
OPML vs PDF — 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.
PDF Strengths
- Pixel-perfect fidelity across operating systems, browsers, and printers.
- Embeds fonts, so documents render identically without the reader having them installed.
- Supports digital signatures, encryption, and redaction for legal workflows.
- ISO-standardized (ISO 32000) with multiple validated subsets (PDF/A, PDF/X, PDF/UA).
- Supports both vector and raster content, keeping line art crisp at any zoom level.
Limitations
- Editing is difficult — the format is optimized for display, not mutation.
- Text extraction can scramble reading order in multi-column layouts.
- File sizes balloon quickly when embedding high-resolution images or fonts.
Quality & Compatibility
The conversion preserves document structure rather than pixel-perfect rendering: a paragraph in OPML is a paragraph in PDF, not a bitmap snapshot. That means you can still edit and search the PDF. 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 PDF 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 PDF degrades gracefully when a font is missing on a viewer device.
- For archive-quality output, export to PDF/A after converting to PDF; 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 PDF at full resolution, editable tables become native PDF tables, and hyperlinks keep their URLs. Complex features unique to OPML — macros, form fields, track-changes — are mapped where an equivalent exists in PDF 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.
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.
PDF Document
Target formatPDF is the universal standard for sharing documents with consistent formatting across all devices and operating systems. It preserves fonts, images, and layout exactly as intended by the author.
Going the other way? Convert PDF back to OPML with the same engine.
Common Use Cases
Share across platforms
Send PDF files to anyone without worrying about whether they have the right software for OPML.
Embed in documents
Drop PDF output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
PDF 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 PDF — Typical file sizes
Approximate file sizes for common scenarios.
- Typical RSS reader export (50 feeds) 5-30 KB
- Deep outline (Scrivener novel plan) 20-200 KB
- 1-page text-only memo 50–150 KB
- 10-page report with images 500 KB – 2 MB
- Scanned document (per page) 100 KB – 1 MB
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Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
PDF/X: The Complete Guide to Print-Ready PDF Standards
Complete guide to PDF/X standards: X-1a vs X-3 vs X-4 differences, required elements, OutputIntent and FOGRA39 profiles, TrimBox/BleedBox page geometry, ink...
Read guide →PDF/A: The ISO Standard for Long-Term Document Archival
Complete guide to PDF/A archival format: PDF/A-1/2/3/4 conformance levels, prohibited features, font embedding requirements, Ghostscript conversion, VeraPDF...
Read guide →PDF Format: Complete Technical Guide to Portable Documents, Forms, Signatures & Encryption
Learn PDF (Portable Document Format): Document structure, object types, cross-reference table, content streams, compression, encryption, digital signatures...
Read guide →
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