1 · Input
Drop image here or click to browse
PNG or JPG
2 · Preset
3 · Threshold
Otsu auto-threshold — recommended
4 · Refinement
5 · Edges
Traces outlines into smooth curves instead of blocky pixels — crisp at any size. Powers SVG / vector-PDF export.
6 · Output
No image yet
Drop a PNG of your line art on the left. The app strips anti-aliasing, removes grey pixels and speckles, smooths and thickens the outlines, then gives you a pure black-and-white, print-ready page.