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
🧭 Kindle niche finder
Type a topic and see what real Amazon shoppers search for around it — live Kindle suggestions, book-buying intent, and niches worth watching.
Open →
🔍 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.
Open →
📐 KDP cover size calculator
Exact full-wrap cover dimensions for paperbacks and hardcovers — spine, bleed, and spine-text rules, in inches and millimeters.
Open →
💰 KDP royalty calculator
Your exact royalty per sale — 35% vs 70% eBook plans with delivery fees, and the 50%/60% print split with real printing costs. KDP's current rates.
Open →
📄 Book page count calculator
Words to printed pages for any trim size, font, and spacing — the number that drives your spine width, printing cost, and royalty.
Open →
📏 Book spine width calculator
Spine width from your page count and paper type, plus whether KDP will print your spine text.
Open →
🧮 Self-publishing cost calculator
Tick what you plan to buy — editing, cover, formatting, keywords — and see the real price range, from author-reported numbers.
Open →
🎨 KDP cover template generator
Download a print-ready 300 DPI cover template for your exact trim, pages, and paper — spine, bleed, safe areas, and barcode zone marked. Design on top in Canva or Photoshop.
Open →
📦 KDP author copy calculator
What a box of your own books costs: per-copy printing cost with no markup, order totals, and realistic shipping estimates.
Open →
✍️ 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.
Open →
📖 Kindle Unlimited calculator
What KU pages read actually pay: word count to KENP pages to dollars, with an honest comparison against regular sales.
Open →
Guides & references
🚀 How to publish on Amazon, step by step
The complete walkthrough: account, formatting, covers, ISBN, listing, pricing for the royalty cliffs, upload, review, and launch — with real costs.
Open →
🛠️ KDP upload errors, explained
'Error processing your interior file,' cover dimension mismatches, margin violations, font embedding — every common failure and its fix.
Open →
🔢 KDP ISBN: free vs. your own
Ebooks need none, print gets one free, and buying from Bowker only matters in three situations — here's the whole decision.
Open →
🔑 KDP keywords guide
How the 7 slots really work, a free research method using Amazon's own search data, and worked examples by genre.
Open →
🏷️ KDP categories guide
Pick the 3 categories you can actually rank in: the niche-down strategy, browse-tree research, and how bestseller badges happen.
Open →
📚 KDP trim sizes chart
Every paperback and hardcover size with bleed dimensions, regular-vs-large cost classes, page limits, and which trim to pick by genre.
Open →
📖 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.
Open →
🧯 epubcheck errors, explained
Plain-English fixes for the validation errors every store relies on — RSC-005, OPF-014, mimetype problems, and friends.
Open →
🍎 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.
Open →
⚖️ Vellum alternative
What Vellum does beautifully, where it stops, and how publish.ai compares — honestly, including where Vellum wins.
Open →
⚖️ Atticus alternative
Formatting software vs. a done-for-you launch package: prices, trade-offs, and who each is right for.
Open →
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.