Printable puzzles
A page of puzzles with an answer key, ready to print in one click.
- Sudoku
Free Sudoku Generator
Printable 4×4, 6×6 and 9×9 sudoku in Easy, Medium or Hard, with an answer key.
Open tool - Mazes
Free Maze Generator
Classic mazes and mazes for kids, freshly generated for every PDF, with solutions.
Open tool - Word Scramble
Free Word Scramble Generator
Word scramble worksheets from five themes or your own spelling words, with answers.
Open tool - Missing Vowels
Free Missing Vowels Generator
Fill-in-the-vowels worksheets from five themes or your own spelling words, each word with one right answer.
Open tool - Cryptogram
Free Cryptogram Generator
Cryptograms from your own quotes or themed word lists, each checked to have exactly one solution.
Open tool - Wordoku
Free Wordoku Generator
Letter sudoku where one row spells a hidden word — 9×9 or small grids for kids, with your own words and answers.
Open tool - Word Search
Free Word Search Generator
Word search puzzles from five themes or your own word list, for kids and adults, with answers.
Open tool
Word & text helpers
Clean up word lists and check how long your book will be.
Publishing calculators
Size your cover, price your book and see what you really earn on Amazon KDP.
- Royalties
Free KDP Royalty Calculator
See your royalty per copy on Amazon KDP — printing cost, the 60 % price point, Expanded Distribution and Kindle 35 % vs 70 %.
Open tool - Profit
Free KDP Profit Calculator
Your real KDP profit: royalties minus ads, software and one-time costs — with break-even and the ACoS your ads can afford.
Open tool - Cover size
Free KDP Spine Width Calculator
Exact spine width and full cover size with bleed for any KDP paperback — plus a cover template to download.
Open tool - Covers
Free KDP Cover Size Calculator
Cover dimensions for every KDP format — paperback with bleed, hardcover with wrap and hinge, and Kindle eBook.
Open tool
Everyday tools
Handy for anyone — no puzzle book needed.
Free tools FAQ
Are these tools really free?
Yes — free forever, with no sign-up and no credit card. We build them for the puzzle and KDP community; if you ever need whole books, the Wisdom Effect generator is there for that.
Do I need an account?
No. Every tool works without an account. An optional free account unlocks bigger PDFs (up to 10 pages) in the puzzle tools and QR codes for images.
Can I sell what I make with the free tools?
Puzzles from the free tools are for personal and classroom use. To sell puzzle books on Amazon KDP, create them in Wisdom Effect — books made on paid plans and with credit packs come with a full commercial license.
Will there be more tools?
Yes. We add new tools for puzzle makers and self-publishers regularly — every one of them free.
Ready for a whole book?
Turn the same puzzles into print-ready books for Amazon KDP — hundreds of unique puzzles, title pages, answer keys and KDP-safe margins.
- Sudoku Book Generator
- Maze Book Generator
- Word Search Book Generator
- Word Scramble Book Generator
- Cryptogram Book Generator
- Wordoku Book Generator
- Missing Vowels Book Generator