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. You need no account and pay nothing, and the solver checks each grid for a single solution before it reaches your printer.
Set the run
configure the batch before printing
1–60 · the solver checks each puzzle for a single solution before adding it
This sample switches to your own puzzles when the run finishes.
A sudoku printable you control
Most free printable sudoku comes as a fixed PDF someone made once, with forty puzzles in one layout at whatever difficulty they picked that day. This generator builds the sheet when you ask. Ask for eleven hard puzzles, four to a page, on US Letter, with the answers at the back, and you get that sheet. Five minutes later you can press the button again for a different eleven.
The generator makes fresh puzzles each run instead of pulling them from a library, so you will not print the same grid twice or hand out a puzzle someone in the room already has. The generator, the solver that checks each puzzle and the PDF builder all run in your browser. We upload and store nothing, and you need no account to download.
You get a clean printed page. Heavy rules mark the 3×3 box borders so the grid reads at a glance, and each grid carries its puzzle code, difficulty and clue count underneath. The footer numbers each page, and an answer key, if you want one, follows the same order as the puzzles.
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. A background thread builds the puzzles one at a time, and a solver checks each for a single solution before the generator accepts it. The preview sheet shows each puzzle as it comes off the press.
03
Print it
Download the PDF and print it. The margins sit inside the printable area, heavy rules mark the 3×3 boxes so the grid reads clearly, and the footer numbers each page.
Why every puzzle has exactly one answer
A grid with two valid solutions forces you to guess at some point, which defeats the point of a logic puzzle. Plenty of free generators skip the uniqueness check because it costs the most computing time. This one runs it on each puzzle.
The generator starts each puzzle from a complete, valid 9×9 grid built by randomised backtracking. It then removes clues one at a time in random order. After each removal a bitmask solver counts the solutions of the remaining grid, stopping as soon as it finds a second one. If it finds one, the generator puts the clue straight back, so it keeps only removals that leave a unique solution.
Fewer clues mean far more solver passes, so an expert batch takes a moment longer than an easy one. In return, the clue count printed under each grid is a measurement of that puzzle you can check.
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.
- Easy printable sudoku38–45 cluesPlenty of clues, and a solving path you can find by scanning alone.typical solve: 5–10 minutes
- Medium printable sudoku30–37 cluesThe everyday sudoku, at the level a newspaper prints midweek.typical solve: 10–20 minutes
- Hard printable sudoku25–29 cluesSparse grids that open up once you reason about where each digit cannot go.typical solve: 20–40 minutes
- Expert printable sudoku20–24 cluesAbout a quarter of the grid filled in, and one solution to reach.typical solve: 40 minutes to over an hour
Questions people ask before they print
Is it free?
Yes. You pay nothing for puzzles or PDFs, and you need no account or email address. The printed sheets carry no watermark. The expert grids come from the same generator as the easy ones, with more clues removed, so no paid tier holds anything back.
Can I get the answers too?
Yes, in two ways. Tick "Include answers" before you generate, and the PDF adds a section after the puzzles with each solution labelled by its puzzle code. That suits a teacher who wants to keep the answer pages back. Or leave the box unticked and look up any solution 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 the one that matches your printer before you generate. The generator sets 16 mm margins on all four sides, inside the printable area of home and office printers, so 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 with room for notes. Two per page suits most solvers. Four or six per page saves paper when you want a stack of puzzles for a trip or a class.
Does every puzzle have exactly one solution?
Yes, and the generator checks it. It starts from a completed grid and removes one clue at a time, running a solver after each removal. If a removal would allow a second answer, the generator puts that clue back. A puzzle reaches your PDF only after the solver confirms a single solution.
Do my puzzles get uploaded anywhere?
No. JavaScript in your browser generates the puzzles and assembles the PDF. Your run never reaches a server, which is why the download starts at once and why the page keeps working offline after it loads.
How long does a big batch take?
A few seconds for most runs. Sixty puzzles take longer than six, and expert puzzles take longer than easy ones, because the solver does more work at each removal step. Generation runs on a background thread, so the page stays responsive while a progress line shows which puzzle it is setting.
Can I use these puzzles in a classroom or a newsletter?
Yes. Print them for your class, your care home or your parish newsletter. A computer generates the grids and we claim no ownership of them, so you do not need to ask permission, credit us 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 of sudoku and the habits that get you through an easy grid. Once easy puzzles feel too simple, the solving techniques guide continues from there.