Separate the intended outline from revisions
A sketch may contain a final outline, trial strokes, eraser residue and several dimension alternatives. Tracing cannot reliably decide which version you intended. Remove clearly discarded marks from a copy and keep the original for comparison.
Making every stroke thicker does not resolve ambiguous revisions. It may merge nearby edges and obscure small details. Distinguishable, continuous strokes are more useful than uniform darkness.
Inspect junctions and intentional gaps
Look at intersections, corners and short endpoints. When several marks merge into a dark patch, their connections will require close review in the result. Do not close a gap simply to make the outline look tidier if that gap represents a real opening.
A hand-drawn circle or straight edge does not establish an exact radius, parallel relation or right angle. The site does not certify those geometric constraints. Apply them later in CAD according to the actual design.
Keep labels distinguishable from structural lines
Numbers crossed by arrows or written over an outline are harder to check. When redrawing a sketch is practical, leave space around labels and make their leaders clear. If the source must remain untouched, retain enough surrounding context to inspect the recognized result.
Prioritize marks that change meaning, such as decimal points, units and quantities. OCR can create editable text, but it cannot establish whether a handwritten number is correct or which feature it was intended to dimension.
Use the result as a starting point for CAD editing
Review the overall shape before inspecting every short segment. Then examine junctions, openings, curves and text. Establish which design the outline represents before calibrating scale or adding dimensions.
A product photograph or perspective rendering is outside this line-tracing workflow. Supply a technical drawing or line sketch rather than expecting the site to infer a complete structure from a photograph.
- Keep the original and clean up clearly discarded marks on a copy.
- Upload the line sketch and generate a preview.
- Compare junctions, openings and recognized text.
- Download and edit geometry according to known dimensions and design intent.