All free — no signup, no email gate
Self-publishing tools & guides
The math, checks, and store quirks that trip up every first upload — turned into free tools and short, accurate references. Built from the same pipeline that produces our customers’ books.
Interactive tools
🔍 KDP manuscript checker
Drop in your .docx and catch tab indents, manual page breaks, and missing heading styles before KDP does. Runs in your browser — nothing is uploaded.
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📐 KDP cover size calculator
Exact full-wrap cover dimensions for paperbacks and hardcovers — spine, bleed, and spine-text rules, in inches and millimeters.
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📏 Book spine width calculator
Spine width from your page count and paper type, plus whether KDP will print your spine text.
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🧮 Self-publishing cost calculator
Tick what you plan to buy — editing, cover, formatting, keywords — and see the real price range, from author-reported numbers.
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✍️ KDP description HTML generator
Write your Amazon book description with simple formatting and get clean, KDP-supported HTML with a live 4,000-character counter.
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Guides & references
📖 KDP margins, gutter & bleed cheat sheet
The gutter table by page count, minimum margins with and without bleed, and the mirrored-margins Word setup — all of KDP's print math on one page.
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🧯 epubcheck errors, explained
Plain-English fixes for the validation errors every store relies on — RSC-005, OPF-014, mimetype problems, and friends.
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🍎 Why Apple Books rejected your EPUB
The competitor-reference trap, font licensing, cover-size minimums, and how to build one clean edition that uploads everywhere.
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⚖️ Vellum alternative
What Vellum does beautifully, where it stops, and how publish.ai compares — honestly, including where Vellum wins.
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⚖️ Atticus alternative
Formatting software vs. a done-for-you launch package: prices, trade-offs, and who each is right for.
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The tools are free. The whole job is $29.99.
publish.ai turns a finished manuscript into a complete KDP launch package — validated EPUB, designed covers, print-ready PDFs, listing copy, and launch graphics — delivered to your inbox in minutes.