Free online OPML to EPUB converter
Convert OPML outlines into EPUB e-books using HTML or Markdown as an intermediate step.
Convert OPML to EPUB online - free
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How to convert opml to epub file
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OPML is an XML-based outline format used to store lists, notes, feeds, and structured hierarchies. EPUB is a widely used reflowable e-book format designed for reading on e-readers, tablets, phones, and desktop apps.
What this conversion means
Converting OPML to EPUB turns an outline or collection of nested items into an e-book file that can be opened in reading software. This is useful when you want to publish notes, research outlines, or structured content as a readable book.
Best software for the conversion
The best choice depends on how your OPML is structured. For most users, Calibre is the best overall e-book tool for creating and managing EPUB files, but it does not directly import OPML in a simple one-click way. A practical workflow is to first convert OPML into HTML or Markdown, then use Calibre to convert that file to EPUB.
If you need a more direct conversion, use an OPML editor or script-based converter to export the outline into HTML, then open it in Calibre and choose Convert books to create the EPUB.
Recommended conversion workflow
- Open the OPML file in an OPML editor or a script that can parse outlines.
- Export or transform the outline into HTML with headings and lists.
- Open the HTML file in Calibre.
- Select Convert books and choose EPUB as the output format.
- Review the result in an EPUB reader and adjust formatting if needed.
Why HTML is usually the best intermediate format
HTML preserves headings, nested lists, and links very well, which makes it ideal for outline-based content. Since EPUB is built from web technologies, HTML converts cleanly into a readable e-book structure.
Formatting tips for better EPUB output
- Use clear heading levels for top-level and nested outline items.
- Keep lists properly indented so the hierarchy remains readable.
- Remove unnecessary metadata or empty nodes before conversion.
- Check special characters and encoding to avoid display issues.
- Add a title page or cover if the EPUB is meant for distribution.
Alternative tools
Other useful tools include Pandoc for converting structured documents into EPUB, and custom Python scripts for transforming OPML into HTML or Markdown before final EPUB creation. If your OPML contains RSS feed outlines, you may need to clean and reorganize the content first.
Summary
OPML to EPUB conversion is best handled by first turning the outline into HTML or Markdown, then using Calibre to generate the EPUB. This approach gives the best balance of compatibility, formatting control, and output quality.
Note: This opml to epub conversion record is incomplete, must be verified, and may contain inaccuracies. Please vote below whether you found this information helpful or not.
OPML vs EPUB: format comparison
How the OPML and EPUB formats compare on the properties that matter most for this conversion.
| Property | .OPML Outline Processor Markup Language | .EPUB EPUB |
|---|---|---|
| Open standard | Yes | Yes |
| Compression | Uncompressed | Both |
| Typical file size | Small | Small |
| Opens in a web browser | Yes, natively | Partial |
| Further editing | Easy | Limited |
| Metadata support | Basic | Extensive |
| Plain-text readable | Yes | No |
| Best used for | Data exchange | Publishing |
| Introduced | 2000 | 2007 |
| Developer | UserLand Software | International Digital Publishing Forum (IDPF); later maintained under W3C |
| MIME type | text/x-opml | application/epub+zip |
Frequently asked questions
Is the OPML to EPUB converter free?
Yes, converting OPML to EPUB on 101convert.com is completely free. No registration, email address or installation is required.
How large can my OPML file be?
You can upload OPML files up to 500 MB and convert up to 100 files at once in a single batch.
What happens to my uploaded files?
Files are processed automatically and deleted from our servers within a few minutes after conversion. We never view or share your files.
Do I need to install any software to convert OPML to EPUB?
No. The OPML to EPUB conversion runs entirely online in your browser and works on Windows, Mac, Linux, Android and iPhone.
Did the conversion fail?
In most cases, the cause is an incorrect file format. Please upload a valid OPML file for this OPML to EPUB conversion. Occasionally, the issue may be on our side. We analyze recurring conversion failures and disable or fix the converter if we detect a defect.