Generate Random Sudoku Puzzles
Generate random 9x9 Sudoku puzzles. Runs entirely in your browser, so your data never leaves your device.
Output
The result appears here as you type.
How to use Generate Random Sudoku Puzzles
- 1. Pick a difficulty. Select Easy, Medium, or Hard to control how many cells are removed from the solved grid, changing how much deduction the puzzle requires.
- 2. Set the blank character and quantity. Enter Blank character to choose what symbol marks empty cells, and How many puzzles to generate more than one grid in the same run.
- 3. Copy the puzzle grid. Set Separator between puzzles if generating several, then copy the 9x9 grid and paste it into a puzzle book layout, an app, or a printed worksheet.
When to use Generate Random Sudoku Puzzles
Generate Random Sudoku Puzzles produces valid 9x9 Sudoku grids at a chosen difficulty, ready to paste into a print layout or app. Use it whenever you need fresh puzzles without designing each one manually.
- Building a puzzle book manuscript. You are compiling a Sudoku puzzle book and need dozens of unique grids across Easy, Medium, and Hard difficulty tiers to fill each chapter without repeating puzzles.
- Testing a Sudoku solver algorithm. You wrote a solver and want fresh generated puzzles at varying difficulty to confirm the algorithm can solve grids it has never seen before, not just a memorized test case.
- Populating a daily puzzle app. A puzzle app needs a new grid each day. Generating a batch at once with Separator between puzzles set lets you queue up a week's worth of content.
- Printing a classroom logic activity. A teacher wants a quick Easy puzzle to hand out for an early-finisher activity and needs a printable grid with a specific blank character marking empty cells.
Examples
A medium puzzle
Output
53..7.... 6..195... .98....6. 8...6...3 4..8.3..1 7...2...6 .6....28. ...419..5 ....8..79
About the Generate Random Sudoku Puzzles tool
Generate Random Sudoku Puzzles is a free online tool that works entirely inside your web browser. Generate random 9x9 Sudoku puzzles. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 120 Random 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 4 settings, including Difficulty, Blank character, How many puzzles and Separator between puzzles, and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
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
Does Generate Random Sudoku Puzzles cost anything?
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?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
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?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
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.