Made for Amazon KDP · live validation

Book formatting for Amazon KDP with real-time AI

The first editorial formatting that fixes itself by talking. Upload a Word file and the AI gets it ready for Amazon KDP. Any tweak — a title, a margin, a line — is requested in plain language and applied instantly, without touching a word of your original text.

What do you want to change in your book?

The AI formats, it never writes. Your text arrives untouched.

Analyze your book free →
Built for Amazon KDP & Kindle Print-ready PDF For paperback & ebook

Your ebook and paperback, ready for every store

KindleAmazon Apple Books Kobo Google Play NookB&N Smashwords Draft2Digital EPUB
How it works

How to format your book with AI for Amazon KDP and Kindle

01

Upload your Word

Your manuscript as it is, images and tables already in place. No templates to fill in beforehand.

02

See the price instantly

Per-page rate, calculated on the spot based on length and book type. No quote requests, no waiting for a reply.

03

Download, ready for KDP

A validated print interior, plus a clean ePub ready for Kindle and every other store.

04

Fix it by chatting with the AI

Ask the AI to adjust margins, typography or structure in your own words. You don't need to know anything about layout — just explain it like you would to a real formatter.

05

Formatted to English publishing conventions

We standardize punctuation, quotation marks and typographic conventions to match professional English-language books, without changing a word you wrote.

06

Ready for paperback and Kindle

The print PDF and the ePub come out validated together, ready to upload to Amazon KDP in print or digital.

Conversational editing

Fix your layout by talking to the AI, in real time

No manuals, no learning to format. You say what you want changed, in plain language, as if you were talking to a real formatter, and your book updates instantly.

What's included

Everything a professional book layout needs

Print interior

  • KDP trim sizes (6×9, 5.5×8.5, 5×8, 5.25×8, 8.5×11) and A5
  • Spine margin calculated from page count
  • Page numbers only on content pages
  • Chapter titles, footnotes, italicized quotes

Validation and ebook for Kindle

  • DPI, margin and font checks before upload
  • ePub that's clean from the start for Kindle: correct metadata, cover and TOC
  • Validated for Kindle Direct Publishing, no manual cleanup afterward
  • Warning report before you publish, not after
Under the hood

How Gutter is built

In-house composition engine

HTML/CSS composition to press-ready PDF with editorial typography: the layout is built, not exported from a word processor.

Automatic KDP validation

Margins by page count, image DPI and embedded fonts, checked before the file is delivered.

Text integrity gate

Every delivery is verified character by character against the original manuscript: the AI can't change a single word without it being detected and reverted.

Zero Data Retention

Your text is processed under a zero-retention agreement with Anthropic: never stored, never used to train models.

Trust & safety

Your manuscript, protected end to end with Zero Data Retention (ZDR).

Zero Data Retention (ZDR): the AI uses your text only to format it, in that moment — never stored on any server, never used to train any model. Your book comes in, gets formatted, and goes back to you without leaving a copy.

The AI formats, it never writes — your text reaches you intact.

01

Zero Data Retention (ZDR)

Snippets processed under a zero-retention agreement with Anthropic: never stored, never used to train any model, never accessible to third parties.

02

Nothing extra is kept

Files are held only long enough for you to download them — we never accumulate your material or use it for anything but formatting.

03

Encrypted at every step

TLS in transit, encrypted passwords, EU-hosted infrastructure.

04

The manuscript stays yours

We acquire no rights over your manuscript, ever. It is and remains yours alone, as our terms make clear.

By book type

A mode for every layout

Try it with your own book, free

Upload your Word: the AI analyzes and formats your entire book, free, and you ask for as many changes as you want by talking to it. See the real result, ready for Amazon KDP, and only pay to download it without the watermark.

Analyze your book free →

And if you're not happy with the result after paying, we refund you within 7 days.