Location QR — Settings and quality

Worked example

A 20-byte geo payload fits 29 x 29 at high error correction; keep level H for outdoor signs and a wide light border on coloured surfaces.

That small grid is an advantage: at 720 px with the 18 px border, each module is about 23.6 px, and a physical sign can be read from farther away. As a rule of thumb a phone reads a code from roughly ten times its width, so a 10 cm code works at about 1 m, and a trailhead board read from 2 m needs 20 cm or more.

Outdoor signs get scuffed, so keep level H and do not lower it just to shrink the grid by four modules. A scratch that would ruin a level-M code can still be recovered at H. Combine that with square modules and the dark Classic colours; a pale gradient ending in light teal can fail the 4.5:1 contrast gate or glare away in sunlight.

A common mistake is placing the code on a wooden or tinted plate and reducing the border to save space. On a non-white surface, raise the quiet border toward 32 to 48 px so the code has its own light margin, or print the code on a white panel. Do not widen the logo beyond the default 22 percent on a sign that may get damaged.

Concrete check: for large signage, export 1200 to 1600 px, or download the SVG. Print one test at its final size, tape it in place, and scan from the farthest realistic standing distance in daylight and at dusk.

37.5665, 126.9780

geo:37.5665,126.9780

Short geo payloads leave you room for maximum error correction, which outdoor wear will use up.