Shorter payloads usually create simpler QR geometry
Long URLs and large text payloads can require a denser QR version. The generator uses the QR module matrix directly and reports approximate physical module width; at a fixed model width, denser modules become smaller and harder to print cleanly.
A physical QR code still needs visual contrast
Raised geometry alone does not guarantee scanning. Use material, paint, inlay, lighting, or another finishing strategy that makes modules visually distinct from the background.
Print and scan a prototype
Printer extrusion width, first-layer spread, sanding, paint, and viewing angle can all change module shape. Test the real object from the intended scanning distance before producing multiples.
The encoded destination stays local
OpenFileTools creates the QR pattern in the browser and does not visit the URL or verify the destination.