Free forever · 70 tools
Free tools for Amazon KDP publishers.
Royalty calculators, printable PDF generators, niche research, and AI helpers - built by the team behind Book Bolt.
100% freeNo signupBuilt for KDP
Amazon Research 10
Find niches, check categories, estimate sales, and validate keywords.
Calculator
Amazon BSR Sales Estimator
Estimate daily Amazon sales from a Best Sellers Rank (BSR) using a public velocity curve. Free.
AI toolFree preview
Amazon Category Finder
Find Amazon KDP categories that match your book topic.
AI toolFree preview
Amazon Category Recommender
Get smart, low-competition Amazon category recommendations.
AI toolFree preview
Amazon Category Competition Checker
See how competitive a KDP category is at a glance.
AI toolFree preview
Amazon Sales Estimator
Estimate monthly sales for any Amazon book niche.
AI toolFree preview
Amazon Keyword Generator
Generate Amazon search keywords for your KDP book.
KDP Calculators 10
Royalties, cover sizes, spine widths, margins, and print costs.
Calculator
KDP Royalty Calculator (2026, tiered rates)
Calculate KDP royalties for paperback, hardcover, and ebook - accurate as of June 2025 tiered rates. Free, no signup.
Calculator
KDP Profit Calculator
Project total KDP profit from list price, copies sold, ad spend, and print cost - free, no signup.
Calculator
KDP Cover Size Calculator
Calculate full KDP paperback cover dimensions - spine + bleed + front + back - to the millimeter. Free.
Calculator
KDP Spine Width Calculator
Calculate exact KDP paperback spine width from page count and paper type. Free.
Calculator
KDP Bleed Calculator
Compute KDP interior page dimensions with bleed for trim sizes from 5×8 to 8.5×11. Free.
Calculator
KDP Trim Size Calculator
Convert KDP trim sizes to inches, millimeters, and points. Free reference tool.
Low-Content Generators 25
Free printable PDFs: planners, trackers, logs, paper templates.
PDF generator
Free Handwriting Practice PDF Generator
Create a printable handwriting practice PDF with custom text, ruling, and font size. Free, no signup.
PDF generator
Lined Paper PDF Generator
Create printable lined paper PDFs - narrow, college, or wide rule. Letter, A4, or KDP sizes.
PDF generator
Dot Grid Paper PDF Generator
Free printable dot grid paper PDF for bullet journaling and sketching. Configurable spacing and trim size.
PDF generator
Graph Paper PDF Generator
Printable graph paper PDF. Choose grid size, axis emphasis, and page size. Free, no signup.
PDF generator
Cornell Notes Template Generator
Free printable Cornell Notes PDF template with cue, note, and summary sections.
PDF generator
Music Staff Paper PDF Generator
Printable blank music staff paper. Choose number of staves per page and trim size.
Puzzle & Activity Books 10
Word search, sudoku, mazes, crosswords - print-ready pages.
PDF generator
Word Search Puzzle Generator
Free printable word search PDF generator. Custom word list, grid size, answer key.
PDF generator
Sudoku Puzzle PDF Generator
Generate printable 9x9 Sudoku puzzles with answer keys. Free, unlimited.
PDF generator
Maze PDF Generator
Printable maze puzzles. Choose grid size and number of pages.
PDF generator
Mini Crossword Grid Generator
Generate a blank crossword grid PDF from a word list - draft clues on paper.
PDF generator
Cryptogram Puzzle Generator
Print substitution-cipher cryptograms from your favorite quotes.
PDF generator
Word Scramble Puzzle Generator
Printable word scramble worksheets from your own word list.
Coloring Books 5
AI prompts, page generators, and cover ideas for coloring books.
PDF generator
Mandala Coloring Page Generator
Generate printable mandala coloring pages with adjustable symmetry and complexity.
PDF generator
Geometric Coloring Page Generator
Generate printable geometric coloring pages - tessellations, flowers, and abstract shapes.
AI toolFree preview
Coloring Page Prompt Generator
AI prompts for coloring page images (use with Midjourney or Lovable AI).
AI toolFree preview
AI Coloring Page Idea Creator
AI-generated coloring book concepts and page descriptions.
AI toolFree preview
Coloring Book Cover Concept Generator
AI cover concepts and titles for KDP coloring books.
AI Helpers 10
Generate titles, descriptions, niches, prompts and more.
AI toolFree preview
AI Book Title Generator for KDP
Generate dozens of Amazon KDP book title ideas instantly. Free preview, unlock all with a Bookbolt trial.
AI toolFree preview
Book Subtitle Generator
AI book subtitles packed with KDP keywords.
AI toolFree preview
Book Description Generator
AI Amazon book descriptions that convert browsers to buyers.
AI toolFree preview
Pen Name Generator
AI pen names for KDP authors who want to publish anonymously.
AI toolFree preview
Book Niche Idea Generator
AI book niche ideas tailored to your audience.
AI toolFree preview
Journal Prompt Generator
AI journal prompts for any theme or audience.
Built for KDP publishers
Every tool runs in your browser. Use them as much as you want.
Built by KDP publishers
We sell books on KDP too. These tools fix our own pain points.
Always free
Free tools stay free. Book Bolt's full keyword & niche data is the paid upgrade.
Go further with Book Bolt
Unlock the 9M+ title database, real-time keyword data, and the cover designer.