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EPUB till KEpub
Optimera valfri EPUB för Kobo-läsare genom att konvertera den till KEpub, Kobos förbättrade format med lässtatistik per kapitel och förlopp inom kapitlet. Konverteringen körs helt i din webbläsare — din bok lämnar aldrig din enhet. Gratis, inga konton, inga gränser.
01Välj din EPUB
02Konvertera & ladda ner
When a Kobo is treating your sideload as a plain EPUB
Kobo store purchases are already KEpub, and they are usually DRM, which this page will not open. The books that need the conversion are the ones you copied over USB: a Project Gutenberg novel, a magazine export, a book you compressed on this site. Until the file carries Kobo's sentence spans, a Clara, Libra, Sage, or Elipsa shows ordinary page counts and skips the per-chapter time-remaining line.
The filename is part of the job. Kobo turns the enhanced renderer on for a file that ends in .kepub.epub. A file named .epub can contain every span and still be opened as a plain EPUB. The download uses the double extension for that reason.
The markup this conversion actually inserts
Each sentence becomes a span with class koboSpan and an id such as kobo.4.2. The paragraph number and the sentence number are how the device counts time left in the chapter. CJK punctuation splits the sentence immediately. An ASCII period, question mark, or exclamation mark splits only when whitespace, the end of the text, an opening quote, or a CJK character follows, so strings like 3.14 and e.g. stay intact. The words are not rewritten. The spans are wrapped around the same text.
script, style, pre, audio, video, svg, and math are left untouched. The body is wrapped in div#book-columns and div#book-inner, and one stylesheet line is added so Kobo's default body margin does not stack. In the OPF, the cover item gains the cover-image property if it lacked it, and meta tags whose name starts with calibre: are removed. A chapter that is already a KEpub is skipped, so spans are not nested. A chapter that is not well-formed XML is copied unchanged and listed as skipped. The cap is 120 MB.
What you still will not get
This is not a Kobo driver. It does not write series information into the device database, it does not manage collections, and the statistics appear only after the Kobo itself has counted the spans. There is no conversion back from KEpub to a plain EPUB. Fixed-layout and picture books gain little, because there are few sentences to mark.
A skipped chapter stays in the book, without sentence-level stats. DRM files from the Kobo store are refused. Removing that DRM is not something this page does.
Kepubify and Calibre's Kobo driver
The standalone kepubify tool and Calibre's KoboTouchExtended plugin perform the same class of markup transform, and Calibre can also copy the file over USB and update the device library. If you already manage the shelf in Calibre, the driver is the shorter path.
This page does only the markup. It does not talk to the Kobo, and it removes calibre: metadata while patching the OPF. One file, no install: that is the whole job it is for.
Så konverterar du EPUB till KEpub
Välj din EPUB-fil
Öppna boken från din enhet. Webbläsaren läser den direkt — inget laddas upp någonstans.
Konvertera till KEpub
Varje mening får sin Kobomarkör och boken packas om som en .kepub.epub-fil. En förloppsindikator visar varje steg medan allt körs lokalt.
Ladda ner och kopiera till din Kobo
Spara den konverterade boken och överför den sedan till din Kobo via USB. Enheten känner igen det förbättrade formatet automatiskt.
Vanliga frågor
Why does the download end in .kepub.epub?
Kobo chooses the enhanced renderer from that double extension. A file named .epub is often opened as a plain EPUB even if the spans are present, and the chapter statistics stay off.
What is inserted into a chapter?
Each sentence becomes a span with class koboSpan and an id like kobo.4.2. The body is wrapped in div#book-columns and div#book-inner, and a one-line stylesheet stops Kobo's default margin from stacking. The words themselves are not rewritten.
What if the book is already a KEpub?
A document that already has book-columns or koboSpan is left alone, so spans are not nested. If every document is already converted, the tool stops and says so instead of writing a second copy.
Do I still need Calibre?
Only if you want Calibre to send the book over USB and keep series information in the Kobo database. The span transform itself does not require Calibre. kepubify and the KoboTouchExtended plugin do equivalent markup work on the desktop.
A chapter was skipped. Is the download missing pages?
No. That chapter failed XML parsing or had no body, so it was copied unchanged and will not have sentence-level stats. The other chapters still have their spans. The result line reports how many files were skipped.