I publish books on Amazon KDP, and I kept running into the same small problems — so I made free tools to fix them. They're all static HTML +
vanilla JS, so everything runs in your browser, nothing is uploaded.
Here's what I built:
1. KDP Royalty Calculator — shows what you actually earn per book (ebook 70%/35% plans, paperbacks with printing cost, hardcovers), plus your
breakeven price.
2. ISBN Converter & Validator — convert between ISBN-10 and ISBN-13, validate check digits.
3. KDP Description Formatter — turn plain text into Amazon-ready HTML (bold, italics, line breaks) with a live preview.
4. Keyword Character Checker — keep your 7 KDP keyword slots under 50 characters each.
5. Launch Kit Generator — one book topic in, get 5 titles + subtitle + description + 7 keywords out.
All of them are free, no signup, no watermark: https://aiharryone.github.io/kdp-launch-kit/
If you publish on KDP, I'd love to know which tool helps you most!
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