Sudoku Generator
Generate custom 9x9 Sudoku puzzles with multiple difficulty levels. Customize the design, reveal solutions, and export as printable PNG or scalable SVG.
Puzzle Settings
Puzzle Preview
Puzzle clues are shown in bold, while the numbers revealed in Solution Mode are shown with a lower opacity to help you distinguish between the original puzzle and the answers.
Free Online Sudoku Generator
Create custom 9x9 Sudoku puzzles instantly. Choose your difficulty level, customize colors, and export high-quality printable puzzle sheets. Perfect for teachers, puzzle enthusiasts, and daily brain training.
Guaranteed Solvable
Every puzzle is generated using a backtracking algorithm to ensure it is logically valid and has a clear solution.
Three Difficulty Levels
Whether you're a beginner or a Sudoku master, our Easy, Medium, and Hard settings provide the right level of challenge.
Custom Design
Change the grid colors, text styles, and background transparency to create a puzzle that matches your branding or worksheet style.
Print-Ready Quality
Export as vector SVG for perfect clarity when printed on a full sheet of paper, or PNG for easy sharing online.
How is the difficulty determined?
Difficulty is based on the number of clues provided. Easy puzzles provide about 45 numbers, Medium provides about 33, and Hard provides about 23-25. All generated puzzles are guaranteed to be solvable.
Can I export the solution sheet?
Yes! Simply toggle the 'Show Solution' button to reveal all numbers, then use the PNG or SVG export buttons to download the completed version.
What is the best format for printing?
SVG is the best format for printing because it is a vector format, meaning it won't lose quality or become pixelated even if you scale it up to fill a full sheet of paper.