Free tools

The author's toolbench

The maths and the checking, done for you. Four tools built from the same rules the guides quote and the platform runs — free, no account, and nothing to install.

Files never leave your browserno uploadno sign-upfree

3D pound coins stacked beside a purple ledger book

Ebook royalty calculator

What one sale pays on Amazon KDP, Kobo, Apple, Google, Draft2Digital and Ebokio — each platform's own published rules, dated and sourced.

interactive · GBP · sourced

3D purple price tag tied to a book with two gold coins

Ebook price calculator

A launch price from your genre, series position and goal — with the £1.77 Amazon and £1.99 Kobo royalty cliffs built in, not discovered later.

interactive · GBP · genre bands NEW

3D open book with a magnifying glass and an amber wax seal

EPUB checker

The pre-flight stores run before accepting your book: container, navigation, missing files, metadata, DRM and image weight — in seconds.

browser-only · nothing uploaded NEW

3D white document turning into a purple book along a curved arrow

DOCX to EPUB converter

Turn a Word manuscript into a clean EPUB 3 — chapters from your headings, images kept, validated by the checker before you download it.

browser-only · nothing uploaded

Every figure a tool shows is dated and sourced — the same numbers as the companies comparison and royalties, explained. When you're ready to publish, here's how Ebokio works.