Free tools for KDP authors
13 free tools, no account needed — built from real publishing runs, not theory. If a tool saves your book an Amazon rejection, it did its job.
Checkers & fixers
- Amazon Book Optimizer — free KDP listing checker
Paste your book’s Amazon link and get exactly what to change: the precise KDP categories to select for each format, the 7 keyword slots, plus title, series, cover and price fixes. Free, no account. - Free KDP Niche Checker — Amazon demand & competition for your book idea
Free Amazon KDP niche research tool: live Amazon search demand data plus an honest verdict on competition, how to differentiate, and narrower sub-niches with better odds. - KDP AI Disclosure Guide — do you need to declare AI content on Amazon?
Free interactive guide to Amazon KDP's AI content policy: AI-generated vs AI-assisted, what you must disclose when publishing, and how to answer the KDP form. Updated for current KDP rules. - KDP Cover Match Checker — does your cover text match your metadata?
Free KDP pre-submission check: upload your cover and enter your planned title, subtitle, and author name. AI reads the cover and flags any verbatim mismatch — the #1 cause of silent KDP rejections. - KDP Rejection Decoder — why did Amazon reject your book?
Free guided tool that decodes KDP rejections: answer a few questions and find the mechanical mismatch — cover vs metadata, spine width, ISBN, red-outlined field — behind the silent 'back to Draft' loop.
Calculators
- KDP Ads Break-Even Calculator — can Amazon Ads pay off for your book?
Free Amazon Ads break-even calculator for KDP books: enter list price, page count, and cost per click to see your royalty per copy, break-even conversion rate, and target ACOS. - KDP Margin Calculator (2026) — gutter, page size, and why Print Previewer doesn't match
Free Amazon KDP margin calculator: enter trim size and page count to get the exact inside (gutter) margin, outside margins, and PDF page size KDP checks — plus the 5 reasons Print Previewer doesn't match your file. - KDP Paperback Royalty Calculator (2026)
Free Amazon KDP paperback royalty calculator. Enter your page count and list price to see printing cost and exactly what you earn per sale — including the 60% royalty tier at $9.99. - KDP Spine Width Calculator (2026) — exact spine + full cover size
Free Amazon KDP spine width calculator. Enter page count and paper type to get the exact spine width and full paperback wrap-cover dimensions with bleed — the numbers KDP checks on upload. - Kindle Royalty Calculator (2026) — updated for KDP's new $12.99 70% band
Free KDP royalty calculator, updated for Amazon's 2026 change: the 70% band now reaches $12.99. Ebook royalties with delivery fees, paperback printing costs, and KENP page-read earnings — no email required.
Generators & research
- Free Book Description Generator — Amazon KDP blurb, categories & keywords
Free book description generator for Amazon KDP. Write your book's description, then get the exact categories to select, all 7 search keywords, the reading age, and step-by-step upload instructions. Works before your book is published. No account. - Get book ideas that sell
Tap once for three researched book ideas — the niche, the buyer, and why each sells on Amazon KDP. Pick one and start writing it instantly. - Title ideas from your KDP report
Upload your KDP dashboard report and get data-driven suggestions for your next books.
Prefer it done for you?
The tools are free forever. If you'd rather hand the whole thing off — interior, cover wrap, EPUB, and your Amazon listing — there's a done-for-you formatting service with a free preview chapter before you pay anything.