KDP error: EPUB doesn't pass EPUBCheck validation
Why KDP rejected your Kindle file for EPUB validation errors — and the exact fix. UK-specific, 2026 spec.
The library
EPUB
Expert articles on KDP formatting, self-publishing, and book design for UK authors. 5 guides and counting.
No guides match your search. Try a different term.
KDP Formatting
4 articlesKDP error: Fixed-layout metadata missing for picture book
Why KDP rejected your picture book or comic for missing fixed-layout flags — and the exact fix. UK-specific, 2026 spec.
KDP error: Right-to-left language flag missing in OPF
Why KDP rejected your Arabic, Hebrew or Persian book for missing RTL flags — and the exact fix. UK-specific, 2026 spec.
KDP error: Table of Contents links don't resolve
Why KDP rejected your ebook for a broken Table of Contents — and the exact fix. UK-specific, 2026 spec.
Kindle Publishing
1 articleEPUB vs MOBI: What to Upload to KDP in 2026
Interactive comparison of EPUB vs MOBI for Amazon KDP in 2026. Amazon deprecated MOBI in 2022 — find out which format to use with our decision tree and feature comparison.