Nonogram Solver
A nonogram (picross, griddler, hanjie) solver that shows its reasoning: paste the row clues and column clues (one line per row or column, numbers separated by spaces, up to 25×25) and optionally pre-fill cells you already know by clicking the grid. The solver works exactly like a careful human: for each row and column it intersects all clue arrangements that fit the current state and reports what is forced — "Row 7: cells 4-6 must be filled" or "Column 2: cell 9 must be empty" — stepping line by line with highlights and a running log. When simple line logic stalls it tests a single cell for a contradiction and says so explicitly. Impossible clue sets are reported with the offending line, and puzzles with more than one solution trigger a warning. Print the finished picture with the deduction summary or export it as PNG/SVG.
Runs 100% in your browser — your puzzles never leave your device.
Read the full guide to this tool
Notes
- The line solver computes the full intersection of every arrangement that matches the clues and the cells already known — the same overlap reasoning humans use, extended to its logical limit.
- If no single line yields progress, the solver tries one cell both ways and keeps the value that does not lead to a contradiction; these steps are labeled as contradiction search, not line logic.
- Contradictory clues are rejected with the row or column that fails, and multiple-solution puzzles are flagged with a warning while one solution is still shown.
- Runs 100% in your browser — your words and puzzles never leave your device.
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