Image to nonogram converter
Upload a photo, tweak the filters, download a printable puzzle.
Turn any image into a printable nonogram puzzle. Upload a photo, adjust the filters, and download an empty puzzle grid with clues — ready to print and solve.
How to use
- Upload an image by dragging it into the upload area or clicking to browse.
- Choose Black & White or Colour mode.
- Set the grid size — larger grids show more detail.
- Adjust brightness, contrast, and threshold until the preview looks right.
- Click Download PNG to save a printable puzzle sheet.
Frequently asked questions
Is my image uploaded anywhere?
All processing happens in your browser. Your image is never uploaded to a server — it stays on your device the entire time.
How do I get the best result from a photo?
Adjust the brightness, contrast, and threshold sliders until the preview looks clear. Edge detection works well for line art. Dithering helps preserve gradients in photos.
What is the maximum grid size?
Up to 64 by 64. Larger grids capture more detail but produce harder puzzles with longer clue numbers.
Can I make colour nonograms?
Yes. Switch to Color mode and choose how many colours to use (2 to 8). The tool extracts the best palette from your image automatically.