Format & Export Free · in-browser · optional cloud history

Chapter Heading Formatter

Renumber and normalize "Chapter N" headings across your fiction manuscript. Free chapter heading formatter for self-publishers and KDP ebook navigation.

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Runs in your browser. We don’t use your drafts to train models.
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Paste your text above, then click Transform — or use Try sample for a quick demo.

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About this tool

Messy chapter headings break navigation in ebooks — mixed "CHAPTER 1," "Chapter One," and "Chapter I" styles confuse EPUB table-of-contents generators. This chapter heading formatter finds heading variants, renumbers them sequentially, and applies your chosen format (e.g. "Chapter {n}" or "CHAPTER {n}"). Paste your Story Studio or AI export; formatting runs in your browser.

What you can do

  • Finds Chapter, CHAPTER, and Roman numeral heading variants
  • Custom format string with {n} placeholder for the number
  • Sequential renumbering after structural edits or chapter cuts
  • Preserves optional chapter subtitles after the number
  • One-click copy of normalized manuscript
  • Required pre-step for kindle-kdp-formatter EPUB table of contents
  • Private browser transform — no manuscript upload

Export formatting before KDP upload

Kindle book formatting and print workflows punish inconsistent quotes, scene breaks, and chapter headings. Normalize typography after content edits, then convert Word/DOCX to a KDP-ready EPUB — otherwise you will re-export three times. These transformers run locally in your browser.

Free Kindle book formatter · Publish & launch guide · KDP upload checklist · Export documentation

How to use it

  1. Set your heading format — use {n} for the chapter number.
  2. Paste a manuscript with inconsistent chapter headings.
  3. Click Transform to renumber and normalize all detected headings.
  4. Review output for any headings the tool missed — prologues, epilogues, or parts.
  5. Copy into your master manuscript file before KDP or EPUB export.

Tips for fiction authors

  • Run the formatter after all structural edits are done. Adding or removing chapters after formatting means renumbering again.
  • EPUB readers use chapter headings for navigation. Consistent formatting ensures your table of contents generates correctly on Kindle.
  • Some authors use "Chapter 1: Title" format. Include the colon and subtitle in your format string to preserve titles.
  • AI-generated manuscripts often mix numbering styles (1, One, I). This tool unifies them in one pass before KDP upload.
  • Pair with text-to-markdown if you publish chapters to GitHub, Obsidian, or a static site generator after normalization.

Related guides

Beta Reader Workflow for AI-Assisted Manuscripts How to Budget AI Drafting for a Full Novel The Five-Pass Revision Order for AI-Assisted Novels KDP Upload Checklist After an AI-Assisted First Draft

Common questions
What heading formats are supported?

Lines starting with "Chapter" or "CHAPTER" plus a number or Roman numeral, with optional titles after.

Can I keep chapter subtitles?

The formatter preserves subtitle text after the number when present in the source heading.

Does it work on AI-exported manuscripts?

Yes. AI exports often mix CHAPTER 1 and Chapter 1 styles — this unifies them for EPUB navigation.

Will it renumber prologues?

It renumbers detected chapter headings sequentially. Prologues labeled "Prologue" are not changed — review those manually.

Is my manuscript uploaded?

No. The chapter heading formatter runs entirely in your browser on Entangled Text.

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