Generate a Sudoku Board
Create a valid 9×9 sudoku board or puzzle. Runs entirely in your browser, so your data never leaves your device.
Output
The result appears here as you type.
How to use Generate a Sudoku Board
- 1. Choose how many cells to blank. Set How many blank cells to control the puzzle's difficulty. Zero produces a fully solved board, while a higher number leaves more empty cells for solving.
- 2. Generate the board. The tool builds a valid 9 by 9 sudoku grid where every row, column and 3 by 3 box contains the digits 1 through 9 exactly once.
- 3. Copy the board. Copy the nine rows of digits from the output pane and paste them into a puzzle document, an app, or a printed worksheet.
When to use Generate a Sudoku Board
Generate a Sudoku Board creates a valid 9 by 9 grid, either fully solved or with a chosen number of cells blanked out to form a puzzle. It is useful whenever you need a real sudoku layout without manually constructing one by hand.
- Printing a puzzle for a newsletter. You run a weekly newsletter with a puzzle corner and need a fresh, valid sudoku each time. Generate one with a moderate number of blanks for a solvable challenge.
- Testing a sudoku-solving script. You are writing code that solves sudoku puzzles and need known-valid boards, both solved and partially blanked, to use as test fixtures.
- Demonstrating a latin square structure. A lesson on combinatorics needs an example of a completed grid where every row and column contains each digit once. A zero-blank board provides a clean example.
- Creating a classroom worksheet. A teacher wants a printable sudoku puzzle with a specific number of blank cells matched to students' skill level, generated fresh instead of pulled from a book.
Examples
A fully solved board
Output
123456789 456789123 789123456 … (0 blanks)
A puzzle with blanks
Output
Nine rows of digits with '.' where cells are removed.
About the Generate a Sudoku Board tool
Generate a Sudoku Board is a free online tool that works entirely inside your web browser. Create a valid 9×9 sudoku board or puzzle. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 133 Integer utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
You can shape the output with the How many blank cells setting, and the result refreshes the moment you change it. 2 worked examples further down the page show exactly what the tool produces for real inputs.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Is Generate a Sudoku Board free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Does the generator send anything to a server?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
How do I get a different result?
Run the generator again. Each run is computed fresh on your device, and any options you change are applied to the next result immediately.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.