Square One — Crossword Puzzle Builder

Free!

Build crossword puzzles — from classroom worksheets to NYT-style masterpieces.

🍎

For Teachers

Input a word list and auto-generate the whole puzzle, clues included.

✏️

Full 15×15 and 21×21 support with autofill, rebus cells, and publication checklists.

🌎

Create puzzles in Spanish, French, German, Italian, Portuguese, Dutch, and British English.

🤝

Invite co-constructors to build a puzzle with you in real time — or start a shared session and solve one together.

How it works

Build your grid

Pick a size and symmetry, place black squares, or auto-generate a valid pattern.

Write clues & answers

Edit your crossword puzzle like an OG or try with AI.

Publish & share

Export to PDF, .PUZ, or .JPZ — or publish a live link solvers can play in their browser.