Free printable sudoku puzzles, ready to download as a PDF
Set the difficulty, choose how many puzzles go on a page, and pull a print-ready sheet. No account, no watermark, no cost — and every grid is checked for a single solution before it reaches your printer.
Set the run
configure the batch before printing
1–60 · each puzzle is solver-checked for a single solution before it goes in
This is a live sample puzzle — it updates to your own puzzles once the run finishes.
A sudoku printable you actually control
Most free printable sudoku is a fixed PDF someone made once: forty puzzles, one layout, whatever difficulty they felt like that day. This one builds the sheet when you ask for it. If you want eleven hard puzzles, four to a page, on US Letter, with the answers at the back, that is what comes out — and if you want a different eleven five minutes later, press the button again.
The puzzles are generated fresh each time rather than pulled from a library, so you are not going to print the same grid twice or find the same puzzle someone else in the room is holding. All of it happens in your browser: the generator, the solver that verifies each puzzle, and the PDF itself. Nothing is uploaded, nothing is stored, and no account stands between you and the download.
What you get is a clean printed page. Heavy rules on the 3×3 box borders so the grid reads at a glance, the puzzle ID, difficulty and clue count printed under every grid, page numbers in the footer, and an answer key laid out in the same order as the puzzles when you want one.
How it works
01
Set the run
Choose how many puzzles you want, how hard they should be, and how many should sit on each page. Pick A4 or US Letter to match your printer, and decide whether you want the answer key.
02
Pull the proof
Press Generate. Puzzles are built one at a time on a background thread, each one checked by a solver for a single solution before it is accepted. The preview sheet shows them as they come off the press.
03
Print it
Download the PDF and print it. Margins are set well inside the printable area, the 3×3 boxes are drawn with heavy rules so the grid reads clearly, and every page is numbered.
Why every puzzle has exactly one answer
A sudoku with two valid solutions is not a sudoku — it is a grid where at some point you have to pick, and picking is not solving. Plenty of free generators skip this check because it is the expensive part. This one does not.
Each puzzle starts life as a complete, valid 9×9 grid built by randomised backtracking. Clues are then removed one at a time in random order, and after every removal a bitmask solver runs over the remaining grid and counts solutions, stopping as soon as it finds a second one. If there is a second solution, the clue goes straight back in. Only removals that leave the puzzle uniquely solvable are kept.
That is why an expert batch takes a moment longer than an easy one: fewer clues means far more solver passes. It also means the clue count printed under each grid is a real measurement of that specific puzzle, not a difficulty label someone assigned by feel.
Printable sudoku by difficulty
Each level has its own page with the generator already set, so you can go straight to the puzzles you want.
- Printable sudoku — easy38–45 cluesGenerous clue counts, no guessing, and a solving path that opens up the moment you start scanning.typical solve: 5–10 minutes
- Printable sudoku — medium30–37 cluesThe everyday sudoku — the level a newspaper prints on a Wednesday.typical solve: 10–20 minutes
- Printable sudoku — hard25–29 cluesSparse grids that will not open up until you start reasoning about where digits cannot go.typical solve: 20–40 minutes
- Printable sudoku — expert20–24 cluesStripped to the bone — around a quarter of the grid filled in, and a single solution waiting at the end of it.typical solve: 40 minutes to over an hour
Questions people ask before they print
Is this really free?
Yes. Every puzzle and every PDF is free, with no account, no email address, no trial and no watermark on the printed sheets. There is no paid tier holding back the good puzzles — the expert grids are the same generator as the easy ones, just with more clues removed.
Can I get the answers too?
Two ways. Tick "Include answers" before you generate and the PDF gets a second section after the puzzles, laid out in the same order, with each solution labelled by its puzzle code — useful if you are printing for a class and want to keep those pages back. Or leave it unticked and look a solution up later on the answer lookup page using the code printed under the grid.
What paper size does it print on?
A4 or US Letter — pick whichever matches your printer before you generate. The margins are set at 16 mm on all sides, comfortably inside the non-printable edge of any home or office printer, so nothing gets clipped and you do not need to scale the pages down.
How many puzzles can I put on one page?
One, two, four or six. One per page gives a large grid that is easy on the eyes and easy to write in. Two per page is the everyday choice. Four and six per page are for when you want a stack of puzzles for a trip or a classroom and want to spend less paper doing it.
Does every puzzle have exactly one solution?
Yes, and that is checked rather than assumed. The generator starts from a completed grid and removes one clue at a time, running a solver after each removal. If taking a clue out would leave the puzzle with more than one possible answer, that clue is put straight back. A puzzle only reaches your PDF once it has been verified to have a single solution.
Do my puzzles get uploaded anywhere?
No. The puzzles are generated by JavaScript running in your browser and the PDF is assembled there too. Nothing about your run is sent to a server, which is also why the download is instant and why the site works after the page has loaded even if you go offline.
How long does a big batch take?
A few seconds for most runs. Sixty easy puzzles take longer than six, and expert puzzles take longer than easy ones because the solver has more work to do at each removal step. Generation runs on a background thread, so the page stays responsive and a progress line tells you which puzzle is being set.
Can I use these puzzles in a classroom or a newsletter?
Yes. Print them for your class, your care home, your commute or your parish newsletter. The puzzles are machine-generated and we make no ownership claim over the grids you produce — you do not need to ask, credit or pay.
New to sudoku?
If you have a printed sheet in front of you and no idea where to start, read how to solve sudoku first — it covers the one rule, the first move and the habits that get you through an easy grid. When easy puzzles stop being a challenge, the solving techniques guide picks up where it leaves off.