A sudoku maker that just prints
Printable PDF in one click
No editor and no account: choose your options and the PDF downloads straight away, in US Letter or A4.
4×4, 6×6 and 9×9 grids
Mini 4×4 and 6×6 sudoku for kids and beginners, and the classic 9×9 for everyone else.
Easy, Medium and Hard
Pick the level that fits — gentle warm-ups for beginners or tougher grids for daily practice.
Answer key included
A solution page follows the puzzles, so you can check your answers or hand them out later.
Up to 6 puzzles per page
One big puzzle for easy reading, or 2, 4 or 6 smaller ones to save paper.
Need a whole book?
Wisdom Effect builds complete puzzle books for Amazon KDP: hundreds of unique puzzles, title and copyright pages, KDP-safe margins and a commercial license.
How to print sudoku puzzles
- 1Choose the grid size: 4×4, 6×6 or 9×9.
- 2Pick a difficulty and how many puzzles go on the page.
- 3Keep the answer key on or off and choose US Letter or A4.
- 4Click Download PDF and print it.
Free sudoku generator FAQ
Is this sudoku generator really free?
Yes. No account, no credit card and no watermark across the puzzles — just a small source line at the bottom of each page.
Can I print the puzzles for my class or family?
Yes. The free PDFs are for personal and classroom use: print as many copies as you like for your family, students or residents.
Can I sell these sudoku puzzles or publish them on Amazon KDP?
Not the free ones — every free puzzle is shared with all visitors of this page. For books you sell, create a book in Wisdom Effect: books generated on paid plans and with credit packs get puzzles that are never given to anyone else and a full commercial license.
Do the puzzles come with solutions?
Yes. An answer key page is added after the puzzles by default; switch it off if you only want the puzzles.
Which sizes and difficulties are available?
4×4 and 6×6 sudoku in Easy and Medium, 9×9 in Easy, Medium and Hard. The full app adds giant 16×16 grids and four harder levels, from Master to Inferno.
How many puzzles can I make?
Up to 6 puzzles per PDF, with a fair-use limit of 20 PDFs per hour. To create 100+ puzzles at once, use the book generator — the free trial includes 25 credits.
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Free Duplicate Word Remover
Remove duplicate words from any list, strip accents and see how often each word repeated.
Free Word Counter
Count words, characters, sentences and chapters and estimate your book’s page count for KDP.
Free QR Code Generator
Make QR codes for links, text and images — with your colors, logo and a caption, one by one or in bulk.
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 %.
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.
Free KDP Spine Width Calculator
Exact spine width and full cover size with bleed for any KDP paperback — plus a cover template to download.
Free KDP Cover Size Calculator
Cover dimensions for every KDP format — paperback with bleed, hardcover with wrap and hinge, and Kindle eBook.
Want a whole sudoku book?
Generate 100+ unique puzzles with title pages, answer keys and KDP-safe margins — free trial with 25 credits, no credit card.