Free tools
Calculators, checkers and generators for short books and KDP, free and without an account. Most run in your browser and upload nothing; the three AI tools send what you type to Chapbook's AI.
- AI-generated or AI-assisted? A KDP AI disclosure helper Answer three questions to see whether your book is AI-generated or AI-assisted in KDP's own words, and whether KDP asks you to declare it. Not legal advice.
- Ebook cover size checker and resizer for KDP, Apple Books, Kobo and Gumroad Check an ebook cover against KDP, Apple Books, Kobo and Gumroad, then crop or pad it to each one's size. It runs in your browser; the image is never uploaded.
- Ebook outline generator: plan the chapters of your book Describe your book and get a working title and 3 to 12 chapters from Chapbook's AI, then open the outline as a new book. Free, no account.
- Ebook title generator: title and subtitle ideas for your book Describe your book in a sentence and get up to 8 title and subtitle ideas from Chapbook's AI, then open the one you like as a new book. Free, no account.
- Free word search and maze maker Make a printable word search from your own words, or a maze, in your browser, for ages 3–5 up to adults, with its answer key. Nothing is uploaded.
- How long should a lead magnet be? A length guide by goal and reader A lead magnet length guide: the words, reading time and pages to aim for, by what the lead magnet should do and who reads it.
- KDP royalty calculator: 35% and 70% ebook royalties What one Kindle ebook sale earns on Amazon.com in KDP's 35% and 70% royalty bands, with the delivery cost by file size. KDP's rules checked 29 October 2026.
- KDP spine width calculator and paperback cover template Work out a KDP paperback's spine width and full cover size from its trim, page count, ink and paper, and save a cover template. KDP's rules checked 30 October 2026.
- KDP upload limit planner: 2 new titles per format a week Plan your releases under KDP's limit of 2 new titles per format per week, which resets every Sunday at 00:00 UTC. Free, in your browser.
- Lead magnet idea generator: ideas from your website Enter your website and Chapbook's AI reads it and suggests up to 5 lead magnets your visitors would want, each a book you can open and write. Free, no account.
- Words to pages calculator: how many pages is 5,000 words? How many pages is 5,000 words? About 22 as a US Letter lead magnet. Worked out from real typeset books, by kind, page size and look.
Read a chapter of your own book before you pay for it.
The outline, one sample chapter up to 2,500 words and a watermarked cover are free: 60 Book Credits on sign-up, no card.