Check the print before the print run.

These example codes open qrpainter.com. Their scores come from software tests, not a physical phone trial. Use this sheet to compare sizes, then repeat the check with your own code on its final material.

1. Print at 100% / actual size. Disable “fit to page”.
2. Measure a printed square: its full width, including the light border, should match its label.
3. Try more than one phone in normal and dim light, at the intended distance. Record failures as well as successes.

Print this sheet

Phone / camera: ____________________ Paper / finish: ____________________

Light / distance: ____________________ Result / notes: ____________________

A successful sample scan is not a guarantee for another design. Make your code, save its recovery note, and test the final proof.