Answer
For signage, roll-ups, or large print, export as SVG or PDF — both are vector formats that lose no quality at any size. PNG is a raster image that turns into blurry squares when scaled up, and suits screens and social media only. A practical rule: if the code will be printed larger than an A4 sheet, do not use PNG at all. The tool exports all five formats — PNG, JPG, WEBP, SVG and PDF — at up to 2048px.