Free Printable Sudoku Generator

This is a free sudoku generator that makes printable puzzles. Most online sudoku tools want you to keep tapping the screen. This one does the opposite: it builds a fresh 9×9 puzzle, hands you a print-ready PDF, and gets out of the way so you can solve it with a pencil. Every grid is generated in your browser, has exactly one unique solution, and comes with the answer key on the back.

Why generate your own instead of grabbing a pre-made pack

Our ready-made printable sudoku packs are perfect when you want 30 vetted puzzles in one download. The generator is for everything else: a single puzzle for a long car ride, a stack of unique worksheets for a classroom, a quick warm-up before bed, or a specific difficulty you can't find anywhere else. Click once, get a brand-new puzzle. Click again, get a different one. There is no limit.

How the difficulty levels are set

Sudoku difficulty comes down to how many numbers you start with — the clues. Fewer clues mean more of the grid is empty, so you lean harder on logic and pencil marks:

• Easy — 38 clues. Gentle and forgiving. Good for beginners, kids around 8 and up, and anyone who just wants to relax.
• Medium — 30 clues. One step up, where pencil marks and a little scanning start to matter.
• Hard — 26 clues. You'll need real techniques — naked pairs, hidden singles — to break in.
• Expert — 23 clues. A proper challenge for seasoned solvers. Still exactly one solution, but you'll earn it.

Who this is for

• Teachers and tutors printing unique sudoku worksheets — free, in any quantity, no licensing headache.
• Parents who want one printable puzzle for a flight, a restaurant wait, or a screen-free afternoon.
• Anyone using their phone less — generate a week's worth, drop them in your analog bag, and leave the apps alone.
• Bloggers and newsletters who want a free, no-signup sudoku tool to point their readers to.

The rules, in one line

Fill the 9×9 grid so that every row, every column, and each of the nine 3×3 boxes contains the digits 1 through 9 exactly once. The numbers printed in bold are your given clues — they never change. That's the whole game.

A few tips for solving on paper

If you're new to sudoku, a couple of simple habits make every printed puzzle easier and a lot more enjoyable:

• Start with the most-filled rows, columns, and boxes. Wherever there are already several numbers, the missing digits are easiest to pin down. Knock those out first to build momentum.
• Use light pencil marks. In a corner of each empty cell, jot the digits that could still go there. As you solve, cross them off. This is the single biggest difference between a frustrating puzzle and a satisfying one — and it's a trick you simply can't do as cleanly on a screen.
• Look for the "only square left." If a number can legally go in just one cell of a row, column, or box, it goes there — no guessing required. Good sudoku never needs a guess.
• Take breaks. Stuck on a hard or expert grid? Fold the paper, put it in your bag, and come back later. A fresh look almost always finds the move you missed.