CONVERT PDF → OPML (PDF to OPML)
Fast, secure PDF to OPML conversion. No registration required.
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HOW TO CONVERT PDF → OPML
Drop the PDF file
Upload your document — or a ZIP of several documents for batch conversion — through the web form.
Convert through pandoc
Our pandoc-based pipeline opens the PDF, preserves structure and typography, and writes the OPML.
Retrieve the document
Click the download button; the OPML is delivered as a single file (or ZIP of files for batch jobs).
Starting point: PDF is Adobe's Portable Document Format, the fixed-layout standard for shareable documents. Natural next step, a OPML. A PDF → OPML conversion gives you the right artefact for the next step in the document life cycle. Maybe you are moving from drafting to distribution, or from a proprietary format into an open one, or simply answering a colleague who asked for OPML. KaijuConverter delivers a faithful re-render without any desktop software install. Worth knowing: PDF is Adobe's Portable Document Format, the fixed-layout standard for shareable documents. Meanwhile OPML is a document format oriented around a particular office suite or publishing pipeline.
Why convert PDF to OPML
Opening PDF in the tool that natively reads OPML is rarely clean. Converting upstream rebuilds the document in the target format so headings become headings, lists stay lists, and the receiving tool does not flag layout warnings.
PDF vs OPML — Technical specifications
Side-by-side comparison of the technical details.
- MIME type
- application/pdf
- 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
- MIME type
- text/x-opml
- Extension
- .opml
- Format
- XML with nested <outline> elements
- Standard
- OPML 2.0 (2006)
- Primary use
- RSS subscription interchange
| Specification | OPML | |
|---|---|---|
| MIME type | application/pdf | text/x-opml |
| 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 | — |
| Extension | — | .opml |
| Format | — | XML with nested <outline> elements |
| Standard | — | OPML 2.0 (2006) |
| Primary use | — | RSS subscription interchange |
PDF vs OPML — Strengths and limitations
What each format does best, and where it falls short.
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.
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.
Quality & Compatibility
Headings, paragraphs, lists, tables, hyperlinks and inline images all survive the conversion with their semantic structure intact. Rare features unique to PDF — legacy macros, form fields, obscure frame styles — are flattened to static content where no direct OPML equivalent exists. Tracked changes, where both formats support them, transfer cleanly.
Tips for Best Results
- Round-tripping between PDF and OPML (converting back and forth) can accumulate small formatting drift — do one conversion and stay in that format.
- If the PDF has tracked changes, accept or reject them before converting to avoid surprises in the OPML output.
- Very long documents split cleanly at existing section breaks; add section breaks deliberately if you need precise page boundaries.
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 OPML at full resolution, editable tables become native OPML tables, and hyperlinks keep their URLs. Complex features unique to PDF — macros, form fields, track-changes — are mapped where an equivalent exists in OPML 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.
PDF Document
Source 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.
OPML Outline
Target 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.
Going the other way? Convert OPML back to PDF with the same engine.
Common Use Cases
Share across platforms
Send OPML files to anyone without worrying about whether they have the right software for PDF.
Embed in documents
Drop OPML output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
OPML often produces smaller files than PDF 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.
PDF vs OPML — Typical file sizes
Approximate file sizes for common scenarios.
- 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
- Typical RSS reader export (50 feeds) 5-30 KB
- Deep outline (Scrivener novel plan) 20-200 KB
Sensitive Documents, Scanned OCR, or 500+ Pages?
For legally sensitive archives that must never leave your local network, or multi-hundred page scanned PDFs needing optical character recognition, local document workstations ensure full compliance.
One-time payment with zero recurring commitment: convert files up to 1 GB and 50-file batches for 24 hours.
Convert large videos, PDFs, and lossless audio directly in your browser—100% ad-free with priority queue.
High-throughput cloud pipeline for files up to 1,024 MB, 24-hour encrypted storage, and priority processing.
Offline conversion for multi-hundred page contracts, spreadsheets, and local optical extraction.
High-accuracy legal OCR, certified PDF/A archiving, and compliant document redaction.
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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 coverage limits, Ghostscript conversion commands, and VeraPDF validation.
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 validation, and industry use cases.
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, form fields.
Read guide →
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