BookKraft AI Blog

Publishing Tips for Indie Authors

EPUB errors, KDP formatting, metadata, and tools — everything you need to publish with confidence.

Why Your Book Got Rejected — BookKraft AI formatting guide cover
epub

Why Your Book Got Rejected & How to Fix It

Most KDP and Apple Books rejections happen because of formatting mistakes you didn't know you were making. This guide breaks down every common cause — and how to fix them.

12 min read
Stack of books on a desk representing the path from manuscript to published book on Amazon KDP
amazon kdp

What Is Amazon KDP? A Complete Guide for New Authors (2026)

Amazon KDP is the free self-publishing platform that puts your ebook or print book on Amazon without an agent, a publisher, or upfront fees. This guide explains how it works — royalties, file formats, publishing steps, and the most common first-timer mistakes to avoid.

10 min read
BookKraft AI EPUB Validator showing a score of 8 out of 9 — minor issues found
product hunt

We're Back on Product Hunt

Six months after a rough first launch, BookKraft AI is live on Product Hunt again — this time with the bugs fixed and the product actually working.

3 min read
Open book on a desk beside a laptop, representing ebook formatting and validation
epub

Common EPUB Validation Errors & Fixes (2026)

If your EPUB looks fine in preview but still gets rejected, here's why — and how to fix the most common validation errors before you upload to KDP, Apple Books, Kobo, or IngramSpark.

6 min read
Code editor displaying EPUB file structure and XML markup
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EPUB Ghost Spacing & OPF Errors: How to Find and Fix Them

Ghost spacing and OPF manifest errors are invisible formatting failures that get your EPUB rejected by Apple Books and Google Play. Here's exactly how to find and fix both.

8 min read
MacBook laptop on a clean desk representing Apple Books publishing workflow
epub

KDP Accepted, Apple Books Rejected? Here's Why and How to Fix It

Your EPUB cleared Amazon KDP but Apple Books rejected it. This happens more often than you'd think — here's the exact reason and how to fix it before your next upload.

8 min read
Kindle e-reader displaying a book with a table of contents
kdp

KDP 'No TOC Found' Error: Exact Cause and Step-by-Step Fix

KDP's 'No TOC Found' error stops your upload cold. It means your EPUB's table of contents isn't formatted the way KDP expects. Here's exactly what's wrong and how to fix it.

7 min read
Computer screen showing error messages during an ebook upload process
kdp

KDP EPUB Errors: What Each Error Means and How to Fix It

KDP EPUB errors range from minor warnings to hard rejections. This guide shows you how to identify every error type, what each one means, and the fastest way to fix them.

8 min read
Amazon KDP publishing dashboard open on a laptop screen
kdp

Why Is KDP Rejecting My EPUB? The 7 Real Causes and Fixes

KDP rejection emails are vague. 'Your file could not be published' doesn't tell you much. This guide covers the seven most common KDP EPUB rejection reasons with specific fixes for each.

9 min read
Team of developers collaborating to build a new software product
ebook formatting

What Is BookKraft AI and Why We Built It

BookKraft AI started as a frustration with ebook publishing. Here's the origin story — what we built, why we built it, and what makes it different from other formatting tools.

7 min read
Laptop with book formatting software open, next to a physical book
ebook formatting

How to Format an eBook for Free in 2026: Complete Step-by-Step Guide

You don't need expensive software to format an ebook professionally. Here's a complete step-by-step guide to formatting your ebook for free in 2026 — from raw manuscript to publish-ready EPUB.

9 min read
Multiple digital reading devices showing different ebook formats side by side
ebook formatting

EPUB vs PDF vs MOBI: Which to Use in 2026

EPUB, PDF, and MOBI all have different strengths. Choosing the wrong format for the wrong platform means formatting problems and potential rejections. Here's exactly which format to use and when.

8 min read
Author at a desk writing and preparing a book manuscript for publishing
ebook formatting

Welcome to BookKraft AI: Your Ebook Publishing Toolkit

BookKraft AI is a set of ebook formatting tools built for indie authors who want professional results without the software learning curve. Here's what we built and why.

7 min read