Every image-to-SVG converter I've ever used makes the same promise on its landing page: 100% accuracy . None of them can define what that means, let alone measure it. So I built one that does. It's called Vecline , it's free, MIT, and runs entirely in your browser. But the interesting part isn't the tracer. It's what happens when a tool measures its own output instead of asserting it's good — because the measurements kept disagreeing with the things I'd written in my own README, and I had t...