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

Chapter Heading Formatter

Renumber and normalize "Chapter N" headings across your manuscript.

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Runs in your browser. Results can be saved so you can reopen them when signed in — guests are nudged after a couple of uses.
0 words 0 chars < 1 min
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Paste your text above, then click Transform — or try Sample.

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About this tool

Messy chapter headings break navigation in ebooks. This chapter heading formatter finds CHAPTER 1, Chapter One, and similar variants — renumbers them sequentially and applies your chosen format (e.g. "Chapter {n}" or "CHAPTER {n}").

Export formatting before KDP upload

Kindle and print workflows punish inconsistent quotes, scene breaks, and chapter headings. Normalize formatting after content edits are done—otherwise you will re-export three times. These transformers run locally; nothing is uploaded.

Publish & launch guide · KDP upload checklist · Export documentation

How to use it

  1. Set your heading format — use {n} for the number.
  2. Paste a manuscript with inconsistent chapter headings.
  3. Click Transform to renumber and normalize.
  4. Review output for missed headings.
  5. Copy into your master manuscript file.

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.
  • Some authors use "Chapter 1: Title" format. Include the colon and subtitle placeholder in your format string to preserve titles.
  • AI-generated manuscripts often mix numbering styles (1, One, I). This tool unifies them in one pass.

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.

Related guides

Beta Reader Workflow for AI-Assisted Manuscripts BYOK Cost Control: Budget a Full Novel with API Keys The Five-Pass Revision Order for AI-Assisted Novels KDP Upload Checklist After an AI-Assisted First Draft