title_body: How to split an EPUB into multiple files of one chapter? An EPUB book has multiple chapters. What method to split it into multiple files, each of them consist one chapter, effectively?
upvoted_answer: If each chapter is formatted as an h1-h6 tag or marked with a unique style, you could use Sigil to insert split markers. For example, if all your chapter headings are formatted as &lt;h1&gt; tags, you'd use:
  
  Find:&lt;h1
  
  Replace:&lt;hr class="sigil_split_marker" /&gt;&lt;h1
  
  Then select Edit > Split at markers.