Upload one source
Choose a picture to line drawing source with a clear subject. Crop out anything you do not want before uploading; a busy background creates more competing outlines.
Choose the line style
Use Clean Line Art for scene contours, Subject Only for a white background, or Minimal Line Art for fewer details. Select a model to convert image to line art, then check the displayed credit cost.
Generate and compare
Keep Auto to follow the source proportions, or select another ratio. After you convert image to line drawing, inspect the result at full size and download the version you prefer.