Edward
English · Narration
Upload the DOCX you write in. Heading styles become chapters, every speaking character gets a voice, and you export MP3 or M4B without converting the manuscript first.
manuscript.docx
DOCX
Reading your file…
Lewis Carroll
Alice's Adventures in Wonderland
Alice asks the grinning Cheshire Cat for directions — and gets none.
The Cat only grinned when it saw Alice. It looked good-natured, she thought; still it had very long claws and a great many teeth, so she felt it ought to be treated with respect.
Step-by-step guide
Free to start: no card, nothing to install.
Word to Audiobook
What you get, from manuscript to finished audiobook.
Use cases
Where authors and storytellers put it to work.



Read Aloud or an audiobook?
Read Aloud is built into recent versions of Word and is great for proofreading. Here is what it does and doesn't do.
| FullCastBook | Word Read Aloud | |
|---|---|---|
| Included with Word | No | Office 2019, 2021 and Microsoft 365 |
| Reads your document aloud | Yes | Yes |
| Saves the speech as an audio file | MP3, M4B or ZIP per chapter | Not described in Microsoft's help |
| A distinct voice per character | Yes | One voice you select |
| Chapters from your headings | Yes | No |
| Direction and sound tags | [whisper], [laugh], [sigh]… | Speed and voice settings |
Word details from Microsoft Support's "Listen to your Word documents" page, checked October 2026.
Demo performances. In the studio you cast from standard and premium voice lists.
English · Narration
English · Narration
English · Narration
English · Narration
English · Narration
In depth
Most manuscripts are written in Word, so a Word document to audiobook route that starts from the DOCX saves a step: no EPUB export, no print PDF with page numbers to clean up. The structure you already gave the book, its headings and paragraphs, is what the audiobook is built from.
For DOCX to audiobook, FullCastBook reads the file, turns your headings into chapters, attributes each line of dialogue to a character, and gives the narrator and every character their own voice. Hear a full-cast scene on the home page, then try a chapter of your own.
In a DOCX to audiobook conversion, chapters come from paragraph styles, not from how the text looks. FullCastBook takes the highest heading level you used at least twice, usually Heading 1, and starts a chapter at each one, titled with the heading text. Custom styles count too if they carry an outline level, as Word's built-in headings do. One catch: if part titles are Heading 1 and chapters Heading 2, each part arrives as one long chapter, so give the chapters the top level.
The Title style sets the book's name and isn't read as a chapter. Text before the first heading, if it runs to more than a few lines, becomes an "Opening" section suggested to leave out, and headings such as Copyright, Contents or Acknowledgements are flagged the same way. No heading styles at all? FullCastBook falls back to typed headings: a line reading "Chapter 3", "CHAPTER THREE" or "Prologue" on its own starts a chapter.
A few habits make both the chapters and the casting more accurate. Use real heading styles for chapter titles instead of bold, enlarged text. Put dialogue in quotation marks and keep one style throughout, straight or curly. Tag the speaker now and then in long exchanges with a plain "said Mara", because that is what speaker detection leans on.
Scene-break symbols such as * * * come through as text; if one shows up as a line in a chapter, delete it. Only the main body is read: footnotes, endnotes, comments, page headers and footers, and images are left out. Tracked deletions are skipped and insertions kept, so the audio follows the document as if every change were accepted. Resolve your changes first if that isn't what you want.
For a whole book, an M4B with chapter markers is the audiobook format: one file, a marker at every chapter, and a chapter list in audiobook players. For Word to MP3, choose one MP3 for the whole document or a ZIP with one file per chapter, which suits players and stores that want separate tracks.
DOCX to MP3 is also the quickest way to put a short piece, such as a story or an essay, on your phone. The files have no DRM added, and they're yours.
Hearing a draft read aloud catches what the eye skips: repeated words, dialogue that trips, a tag that sends a line to the wrong character. With a cast instead of one flat voice, you also hear whether each character sounds like themselves.
Generate the chapters you're revising, note what jars, and fix it in Word, then upload the new DOCX. For a small fix, edit the line's text in the studio and regenerate just that line. The manuscript to audiobook guide covers working from a draft that keeps changing.
Word has Read Aloud on the Review tab in Office 2019, Office 2021 and Microsoft 365. It reads the document from your cursor in a voice you choose, at a speed you set, which is handy for proofreading. As of October 2026, Microsoft's help page describes no way to save that speech as an audio file, and there are no chapters or character voices.
To convert a Word document to audiobook files you can keep, share or publish, you need a tool that writes audio, and FullCastBook does that from the same DOCX. If your text isn't in Word, text to audiobook takes a paste or a TXT file, and the AI audiobook generator covers every format.
Word can read a document aloud with Read Aloud, but Microsoft's help describes no option to save that speech as an audio file. To get MP3 or M4B files from a DOCX, use a converter such as FullCastBook.
No, only .docx. Open the file in Word and use File > Save As > Word Document (.docx), or download it as .docx from Google Docs, then upload that.
Upload the DOCX, check the chapters and the cast, generate, then export one MP3 for the whole document or a ZIP with one file per chapter. The free sign-up credits cover a short sample chapter.
Yes, if they use heading styles: the top level you used, usually Heading 1, becomes the chapters and their titles. Headings typed as plain text are picked up when they read like "Chapter 3" or "Prologue".
There's no pronunciation dictionary, but you can edit the line's text, for example spelling a name the way it sounds, and regenerate just that line. Regenerating uses credits again.
Your manuscript is used only to provide the service, and not to train our own AI models. Language and voice providers process the text to narrate it; the privacy policy lists who they are.
Upload the manuscript, check the chapters and the voices, and export MP3 or M4B. Free to start.