Choose an image with useful edges
Line extraction responds to changes in brightness, including the ones in fabric, grass, and shadows. A quiet background and clear subject outline usually produce a cleaner reference. If texture overwhelms the subject, prepare a closer crop or try a different source before pushing every setting to an extreme.
Adjust detail before thickening the lines
Use the threshold to decide which edges appear, then increase thickness only enough to make them readable. Thick lines can join nearby details and close small gaps. Compare facial features, hands, or other important parts after each change instead of judging the result solely by how dark the whole image looks.
Use the free download as a raster reference
The basic conversion and download need no login. It exports PNG with a light background and a longest edge capped at 2200 pixels, not editable SVG paths or a cut-ready vector stencil. Optional AI enhancement is separate from this browser conversion.