Your SVG
Paste any SVG (a lowlighter/metrics card, a badge, a diagram…).
Rasterizing to a crisp PNG needs the CLI (it drives a local Chrome):
npx github:convenientlymike/svgsafe render card.svg --scale 3
Diagnosis
Live preview
Browsers other than iOS Safari scale this fine — which is exactly why the bug hides on desktop. The checkerboard shows transparency.