Drop an image and every mkbitmap and potrace parameter re-traces against it as you drag, with the bitmap the tracer actually receives on a tab of its own. Nothing here needs an account.
or drop one anywhere on this page
Recorded trace · the same pipeline
Zero keeps every corner sharp; 1.33 rounds everything into curves. Turn Nodes on and drag it: the same drawing goes from 7,177 anchor points to 2,246. Load the sample above and the same control does this live, against your own image.