Crossword Generator

Pick a few words you want in the puzzle and the generator fills in the rest of the grid, writes the clues, and hands you something playable. Try it here.

• Seed words - Give it the words that matter to you; the solver places them first and builds the grid around them
• 5×5 or 7×7 - Two grid sizes, generated a week at a time so you can build a run of puzzles in one go
• Your own wordlist - Upload a list and the fill comes from your vocabulary instead of the default one
• Clues on the fly - Gemini writes a clue for every entry once the grid is solved
• Playable - Solve it in the browser with a timer, on desktop or phone

The grid is filled by backtracking search with a most-constrained-slot heuristic: it tries every way of assigning your seed words to slots, then fills the remaining ones from the wordlist, backing out whenever a crossing can't be satisfied. Clues come from Gemini 2.5 Flash Lite, called straight from the browser with your own API key — there's no backend, and the key never leaves your machine. The whole thing is one page of vanilla JavaScript. Built with Claude.