Coloring page maker

Turn a photo into printable line art — edge detection with adjustable threshold and line darkness.

The photo stays in this browser — edges are detected locally.

PNG, JPG, or WebP up to 25 MiB and 12,000 px per side (40,000,000 px total); larger inputs are scaled for the preview. Output is grayscale line art on white — fine detail and photos with soft focus lose their edges.

How to use

  1. Choose a photo.
  2. Tune the threshold and line darkness.
  3. Download or print the PNG.

What it supports

Grayscale Sobel edge detection on a white background — outputs line art, not shaded sketches. Photos with soft focus or low contrast lose their edges. PNG/JPG/WebP up to 25 MiB.

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