DocBook to OPML Converter
FileFlip converts DocBook to OPML entirely inside your browser, using Pandoc compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert a DocBook file to OPML?#
- Drop your DocBook file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to OPML and the conversion starts on its own. FileFlip downloads 65.8 MB of WebAssembly the first time and nothing after that, then runs Pandoc on your own machine.
- Save the OPML file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting DocBook to OPML lose quality?#
Not in the sense of pixels or samples. Converting DocBook to OPML rebuilds the file in OPML's own model rather than re-encoding it, so everything OPML can represent comes through exactly and anything it cannot has to be dropped. Expect the words to come through exactly and the page breaks to move.
Is it safe to convert DocBook files online?#
Yes, because nothing is uploaded. FileFlip converts DocBook files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What DocBook to OPML actually does to the file#
Converting DocBook to OPML runs on Pandoc, downloads 65.8 MB of WebAssembly the first time and nothing after that, rebuilds the file in the target's own model, keeps selectable text and page layout.
| Engine | Pandoc |
|---|---|
| Conversion path | One step: DocBook → OPML |
| Downloaded to your browser | 65.8 MB, once, then cached by your browser |
| Quality | Rebuilt in the target's model |
| You get back | One file |
| Where it runs | In a background worker, so the page stays responsive |
What survives the conversion
| What is in the file | This conversion | Why |
|---|---|---|
| Selectable text | Kept | Carried through into the converted file. |
| Page layout | Kept | Carried through into the converted file. |
What is a DocBook file?#
A DBK file is a DocBook document, XML markup that describes a technical document's structure and meaning, such as chapters, sections, and code listings, rather than its visual layout, so one source can be styled into a printed book or a web page.
Write in DocBook when producing technical documentation that has to publish to multiple outputs, such as print, web, and help, from one validated source.
Convert DocBook to another format when the reader only needs the finished document and doesn't need to maintain the structured XML source.
What is an OPML file?#
An OPML file is an XML document made of nested outline elements, most often used to move a list of RSS and Atom feed subscriptions from one feed reader to another.
Use OPML to move a list of feed subscriptions between RSS readers, or to export a hierarchical outline from an outliner app.
Convert OPML into a document format like HTML or Markdown when the outline itself, not the feed subscriptions, needs to be read as a document.
DocBook to OPML questions people ask#
What opens a .dbk file?
A .dbk file is DocBook XML, which is plain text, so any text or XML editor opens it, though tools like Oxygen XML Editor or Visual Studio Code with an XML extension add validation and structure awareness. Converting it to HTML or PDF is the usual way to read it as a finished document.
Why is DocBook so much more verbose than Markdown?
DocBook tags every structural piece of a document explicitly, such as marking a term as a <function> or a note as a <warning>, instead of relying on plain punctuation the way Markdown does. That verbosity is deliberate: it's what lets the same source publish correctly to print, web, and help formats without rewriting it for each one.
Is DocBook still actively maintained?
DocBook is still usable and its tooling still works, but the OASIS technical committee that governed the specification closed in September 2024. Development now happens informally rather than through that standards body, which is typical of a format that has settled rather than one still evolving quickly.
What is an OPML file?
An OPML file is an XML document that stores a nested outline, most commonly a list of RSS and Atom feed subscriptions. Feed readers use it to export a subscription list from one app and import it into another.