Match the size to your frame
4 × 6 inches is 101.6 × 152.4 mm. A4 is 210 × 297 mm; US Letter is 215.9 × 279.4 mm. These signs are portrait, single-sided, with a safe content margin.
Use actual size
Select 100% or Actual size, turn off browser headers and footers, and check the printer preview. For a small sign on a larger sheet, use actual size and trim the unused paper. Printer drivers can override page settings.
Test before displaying
Scan the printed QR code with a real phone. Avoid glare, wrinkles, and shrinking the code. The printed network and password provide a manual fallback.