QR Codes on Glass and Storefront Windows: Mirroring, Glare, and Backing

1. Reverse Printing

If the graphic is applied to the inside face of the glass and viewed from outside, the artwork must be mirrored so it reads correctly through the pane. Many scanners can decode a mirrored code, but do not rely on it. Confirm by scanning from the viewing side.

2. Background Problem

Window codes lose contrast because the background changes with daylight and what is behind the glass. Use an opaque white backing panel behind the code, or print a solid light patch.

3. Glare

Reflections from sun and street lights can wash out modules. Prefer matte film and angle the placement away from direct reflections.

4. Height and Safety

Place it at a comfortable standing height, away from traffic where people might step off the pavement to scan.