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Free Online Sudoku Solver

Solve a 9×9 Sudoku from nine rows of digits, with zero or dot for empty cells. Duplicate clues and unsolvable boards are rejected; search is bounded.

Your input stays on this device. Processing is bounded; regex runs in a worker with a two-second timeout.

Result



How to use Sudoku Solver
Solve a 9×9 Sudoku from nine rows of digits, with zero or dot for empty cells. Duplicate clues and unsolvable boards are rejected; search is bounded.
  1. Set Text.
  2. Run the tool, review the result and its stated limitations, then copy or download if needed.
Example & practical use
Solve a 9×9 Sudoku from nine rows of digits, with zero or dot for empty cells. Duplicate clues and unsolvable boards are rejected; search is bounded. The example below demonstrates Text.
Example input:
{
  "text": "530070000\n600195000\n098000060\n800060003\n400803001\n700020006\n060000280\n000419005\n000080079"
}
Expected result (relevant fields):
"534678912\n672195348\n198342567\n859761423\n426853791\n713924856\n961537284\n287419635\n345286179"
Features & result limitations
Solve a 9×9 Sudoku from nine rows of digits, with zero or dot for empty cells. Duplicate clues and unsolvable boards are rejected; search is bounded.
Frequently asked questions
What inputs does Sudoku Solver accept?
Text
How should I interpret the Sudoku Solver result?
Solve a 9×9 Sudoku from nine rows of digits, with zero or dot for empty cells. Duplicate clues and unsolvable boards are rejected; search is bounded.
Where does Sudoku Solver process my data?
Inputs are processed locally in your browser. Submitted text is not sent to external services. A successful-run event increments an aggregate tool counter without your input.