Nonogram Generator & Solver
Build picross puzzles from a random pattern or your own image, then solve them.
Images are thresholded to black/white and resized to the grid — all in your browser.
Generate a random puzzle or upload an image to begin.
About this tool
This nonogram (picross) generator builds puzzles from a random pattern or from an image you upload, thresholding the picture to black and white at your chosen grid size. Row and column hints are computed directly from the solution grid, and the built-in solver uses line-based constraint propagation with a backtracking fallback to prove or find a solution. Everything — generation, solving and image export — runs entirely in your browser, so no picture or puzzle ever leaves your device.
- 100% free — no account needed
- Runs in your browser
- Nothing is uploaded
Frequently asked questions
Is Nonogram Generator & Solver really free?
Yes. Nonogram Generator & Solver is completely free on PureBrowser — every feature, with no account, no trial, and no credit card.
Does Nonogram Generator & Solver upload my data?
No. Nonogram Generator & Solver runs entirely inside your browser, so anything you type, paste, or open stays on your own device.
Do I need to sign up or install anything?
Neither. There is no account and nothing to download — open the page and Nonogram Generator & Solver is ready to use on desktop or mobile.
Does Nonogram Generator & Solver work offline?
Once the page has loaded, yes. All of the processing happens locally in your browser, so it keeps working without a connection.
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